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I had that exact same problem after i installed my injen intake, the car ran absolutly perfect until i installed my intake, drove my crazy, i could not diagnose the problem, reinstalled the intake 10 times cleaned everything, change plugs, fuel filter, cap, rotor, reset computer, cleaned out the throttle body, turned out to be the egr valve, replaced it now it runs fine, though now i have a cracked cylinder head. when will it end.
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