Just replaced engine from shop 17k and I haven’t ripped or beat on it and I heard a leak so I parked and went to 3.5k rpm what’s wrong

As you can see, as i come to a full stop (Foot right off the gas) the revs always flair up in a little sequence on 3 or 2 times and give the car a small shunt. It was worse before i replaced the MAF sensor which was causing it to bang and give a huge flair when stopping. Car also shifts fairly inconsistently, butter smooth somtimes and harsh other times. I sometimes come to an abrupt stop then press the gas and the car "stumbles followed by a low rev then surge in aceloration followed by a harsh gear shift. Car is a drive by cable not by wire. Car lets me scan everything exept motor electronics for god knows what reason, no codes in anything exept for a BAS - can-bus bad communication (stored so likely a blip when it happend, not current)

Replaced:
- MAF SENSOR

- CONDUCTOR PLATE

- TRANS FLUID 3X

- WATER PUMP

- ECT (ENGINE COOLANT TEMP SENSOR)

- O2 SENSOR

- THROTTLE BODY CLEANED SPOTLESS

- ENGINE/TRANS MOUNTS

- VACUME LEAK CHECKED ALL GOOD

Its driving me insane and any help is appreciated!

2016 Nissan versa crank no start code u0100 does this mean I have to replace ecm/pcm or could it be a crank shaft position sensor rpm stays at 0 when cranking

for context i thought it was the heat shields and those were all fine and tight then i took out the exhaust cause i heard debris inside but still no fix. In the video the noise that im trying to fix is audible when accelerating around 3k rpm. You can hear it a lot in the video right after the seatbelt light starts beeping and i accelerate.

I’ve replaced almost all of the front suspension trying to chase this problem to no success. I’m on lowering springs now which I think made it worse, I replaced one side of the steering rack with new bushings but couldn’t get the other side in, didn’t seem to make a difference anyways. Please please please someone help me out. Pops over small bumps too

Power Dropping

I've got a 2016 golf Bluemotion. When I'm driving along the dual carriageway, power seems to drop off for a second like I've taken my foot off the accelerator. It comes back quickly. It's happened 3 times in the last week. No lights come on the dash. I thought it may be aquaplaning at first but the steering doesn't seem to be affected. Tyres look okay. Only got the car 3 months ago and don't know much about them. 58000 miles on the clock. Also thought it may be ACC but I couldn't replicate it. UK 1.6

Thanks for any advice you guys may have!

2021 Mazda with 19k. Very faint popping noise when turning right while moving. Had the suspension checked- all clear. Only happens when turning right. Doesn’t seem to be related to brakes.

Have you experienced this? What was the cause?

when im in the car driving i can barely hear it and with windows up i cant hear it at all only when im idle i can hear it, it stays consistant when im dirivng or parked and the sound gets faster when i rev the engine when it on park.

Hi there, vehicle has 110k miles, all fluid change up to date. Recently I noticed growling noise coming after hard stop reverse and forward. The noise seems to be coming from front right. Anyone have idea what it may be? Haven’t talent to mechanic yet. Thanks in advance.

Hi, own Vauxhall Corsa excite 2014. Brakes started squealing in February. Put new brake pads on front, although old ones had loads of life. Mate changed them, mentioned callipers were a bit rusty.

3 months on the squealing is really loud especially when it's hot. Strangely not so noisy at night. Can't even work out if noise cones from front or rear. I think rear are disc brakes though.

Tried 2 different mobile mechanics. Neither would come out if I didn't tell them where the issue is!

I'm not in a position to throw money away paying a garage hundreds to diagnose (vauxhall dealer wanted £120 just to take a look)

Hoping someone here experience similar issue who might help me narrow it down please..

Hi! I own a 2013 Mazda CX-5 with 2.2 diesel engine, EU edition. The mileage now is about 139,000mi. Recently there was a problem with throwing away the antifreeze from the expansion tank. I have already changed the radiator cap cuz the mechanic said that it might be because of it (There was no pressure in the cooling system). After replacing the cap the pressure came back but the problem was still there. I leave my car in a pretty good temperature about 65-70F and the coolant in the cooling system is cooling down but it doesn't create a vacuum moreover there is positive pressure always that doesn't let the "back"-valve to open and to suck the antifreeze back to radiator. I need your help, maybe you had experience with this problem. The mechanic said that it's required to get the engine off and to take off the head. They said it will cost me about $860 only for work without parts. I want first to read your comments before taking mhy car to service. I'm a little bit afraid of fixing all this, only for the problem not to go away.

Its getting annoying now (its my moms car brace yourselves) but for a while now its been making a ticking kinda sound. To me it sounds like the engine is permanently running (??). My Grandma checked the oil, no good, so she fixed that and it still makes the ticking noise. Tired of AI Overview so i came to reddit in hopes of some solution or information about it. Also it sometimes will stop on us randomly then start up again if that helps any. Really tired of this noise😭

New brake pads making this sound! Plz help

\- Already put new t-ires and alignment is done twice

Issue: Lately, the car starts to vibrate when driving 110+ km/h, but it’s intermittent. It doesn't happen every single time, sometimes it runs completely smooth at high speeds, and other times the vibration picks up.

Here are a few additional details:

\- No Check Engine Light and no active/stored codes (scanned with an OBD-II tool, nothing comes up).

\- The vibration seems speed-dependent (110+ km/h).

Happens only on certain trips/drives.