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  1. I4/I5 Engine & Drivetrain
    So I thought porting and polishing your throttle body wouldn't be too hard, and it wasn't, but when i put the throttle body back it didn't run well at all. I have a i5 3.7l 2008 Colorado when I start it up it has a little high rpms nothing too bad at idle, it calms down to the normal rpm range...
    port and polish problems throttle body
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