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Hello Im a beginner and I’m trying to put together a nice little project car I have a 2002 lancer es just recently change the exhaust system and put a cold air intake kit on it I got a check engine light and the code p0507 that my idle is higher than it’s supposed to be I’ve checked for air leaks I’ve replaced my idle control valve cleaned out my throttle body replaced my spark plugs and I have a extreme rough idle it goes up to 2500 rpms sometimes and will bounce between 1500 and 2000 rpms when coming to a stop today my car also was at such a high rpm when I let the clutch go and didn’t press on the gas my car started to continue rolling off of the high rpm without me touch the clutch or acceleration just put it in first and it started going on it’s own after slightly letting clutch and gas go I feel like I’ve checked everything and don’t know where else to really look any ideas on what I should look out for possibly my catalytic converter???
 
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