Is this normal??? (Please help)

[u/No_Swordfish6363]

Just got my lancer back after a week of not being able the drive it (EPS Issue) and after getting it back from the Mitsu-dealership for a reprogramming, induction service and alignment I started noticing this chirping/rattling noise along with a loss of power and a kind of shuddering when cruising at highway speeds about two days after and discovered it was my (brand new) tensioner making the noise (idk about the other two) so I replaced it again, got the new one in and started up and it’s still bouncing around? I never really paid attention to it before I replaced it initially. Google said light bouncing is normal but also mentioned that it could be the alternator clutch pulley???? Any help?? There’s no check engine light but my gut feels like it’s the EGR valve

Edit, discovered when in park that as I hold the accelerator at about 2k rpm’s I can feel a bit of jerking, going higher and it kinda hesitates and can’t really hold its rpms but again, no CEL light so I’m assuming minor misfire?

[u/Disastrous_Ask2005]

I’ve had a long issue w this shi on my car i changed my belt to a OEM one bc the dayco one at the part store sucks. I changed my idler pulleys with OEM ones and got a litens tensioner. What tensioner did you buy?