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uneven idle

tgprince

By tgprince
in Ask A GM Technician

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tgprince New Member

tgprince

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i have a 2006 sierra, 5.3 with cold air intake, headers, and flowmaster exhaust. the idle has become a problem lately. it only happens once it is warmed up. the tach fluctuates randomly from 400-700 rpms. also if you let off the break and let the truck roll forward with out hitting the gas it jumps and feels like its missing. once you get on the gas she runs fine. im not getting a ses light or anything. pulled the spark plugs and they looked good. not really sure what could be causing it, any ideas?

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