Question about 2004 GMC Envoy
There is a small chance that something was knocked loose when they did the test. be that as it may you seem to have one or two problems. one of the sections of the coil pack may be failing and need to be replace. quick test for this is to pull one lead at a time from the coil pack to see if the engine idle changes. the other issue may very well be a vacuum leak. listen for a whisting sound at idle.
if you do need a coil pack the best (cheapest) way to get one is to drop by your local wrecking/recycling/junk yard. my ford windstar used the same coil pack as a toyota, it cost me $40 dollars as opposed to $160 at the dealer.
Posted on Aug 20, 2010
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Posted on Jan 02, 2017
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