my car has an irregular idle. heard to be common on the 2.0L. and reasons why and how to fix
4g63 ? or 420a? check your vacuum lines
i have a 2.0l 4g63 with the same thing and would also bog down on rev. i was looking aroung in the engine bay checkin the hoses and making sure all the clamps were on tight. i discovered that the cold air intake wasnt on all the way. fixed that took care of the bogging down. i then discovered my header had a crack in it and after i got a new header the idle smoothed right out.
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