I have a 2002 chevy tahoe that rpm surge at low idle. I put a new alt on it about a month ago. could it be the battery?

Asked by GuruL7XTX May 01, 2019 at 11:17 AM about the 2002 Chevrolet Tahoe Z71 4WD

Question type: Maintenance & Repair

1 Answer

26,810

If you have tac/throttle actuator control, I saw a service bulletin for unstable idle, Clean the throttle bore and throttle plate. You might use an old tooth brush, but, don't force the throttle plate. Could be other issues? Any applicable trouble codes?

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