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99 gm idle miss?

nlhram500

02-17-2009, 09:12 PM

I have a 99 GM that has a miss at idle. Can't feel anything usually, but waiting at a stoplight with the a/c on, I get a "bump bump bump" every so often and it seems to be getting worse. I have replaced all the plugs and COPs. No vac leaks, no check engine light. Any Ideas.. Please Help.

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