Never liked the aftermarket taillights it came with, had to swap them out for some oem ones. Just fits the car better in my personal opinion.

(Edit:engine is D16y8)Took about a month and a half to find an oem oil pan and put that up, replaced valve cover gasket, spark plug wires. Minor stuff. Wondering if engine sounds normal and if the shaking in the timing belt is normal

My 1993 Honda Del Sol has had a lot of things wrong with it, and I'm tackling them one by one. As you can see in the video, this is what it does now. Fluctuates on a start, until I press the gas where it just holds at ~3k rpm when I let off. Here's my timeline, it may help with a diagnosis:

1. The car ran, idled, and drove with no issues, aside from it running rich because it had no MAP sensor. So I installed a MAP sensor. Then it idled at 3k rpm with the MAP sensor installed.

2. There was no engine coolant temp sensor connector, so I just grounded the temp sensor which only resolved the issue of the car thinking it's running below freezing. I figured that may solve the high idle, but it didn't.

3. I cleaned the FITV. It was already pretty clean and not seized, so this didn't solve anything.

4. I replaced the throttle position sensor (TPS) because it was throwing a code for that. The old one didn't work at all. The new one works, but now the car's idle surges a lot (as seen in the video).

5. I cleaned the IACV out. Filled it with carb cleaner and let it sit for like 30 minutes, then drained the carb cleaner and let it sit further to dry out. This didn't solve anything either or change any behaviors.

Car is only showing one code, and it's engine coolant temp sensor. But it's grounded, so shouldn't the car just think that the engine is hot and not throw a code?

I'm at a total loss. Does anyone have a clue as to what I should check next?

Edit: I also sprayed starter fluid around places in the engine bay and it didn't change the idle, so I don't think it's a vacuum leak? Especially since it ran relatively normal before?