Alright, did some error checking.
I got codes 21 - Oxygen sensor
41 - Throttle Position Sensor
and 43 - Starter
Could the throttle position sensor be responsible for the rough idle?
So I definitely get that surge at 3500 to 3800 rpm. After some research, it seems my ACIS is screwed. I need to e-mail the owner, but I have a JDM transplant motor. Possibly an ex cresseda motor, but the throttle body was changed out. What's the best way to go about fixing the ACIS?
Any pics...
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