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· Banned
2004 gmc
26,436 Posts
We actually can give better advice if we know what engine you have as well.

But my traditional welcome message (for I6 owners especially) is to disconnect the battery, clean the throttle body, reconnect the battery, drive around for an hour, and THEN start giving us the remaining symptoms. Without a clean throttle body, EVERYTHING else can be a red herring.

At least your mechanic didn't lie and say the tune-up included changing the plug wires, I hope. The I6 doesn't even HAVE plug wires. :crackup:
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