Question about 1999 GMC Yukon Denali
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Locate the coil pack.... pull one spark plug wire at a time... any change in how the motor runs ... replace it and move to the next wire. if you pull a spark plug wire and there is no change you have likely located the problem.
a couple things... if the check engine light is on stop into autozone and have them read the codes (free) also another possibility is a plugged catylitic converter.
Robert
Posted on Feb 12, 2009
i believe they can still retrieve the codes up to three key cycles (on and off)
Robert
check the coil pack... at the coil pack... pull a spark plug one at a time... any change in idle ?... plug it back in and move to the next spark plug lead... if you find one or two that don't have a spark change the coil pack. also check from the air filter to the engine for any air leaks. you may be able to hear the noise.
Robert
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Thanks I'll try the spark plug thing, the other day i was going to take it to auto zone when i started it the check engine light was on but by the time i got there it was off. it ran fine going but on the way home it started being stupid again
Update I put it in the shop a week ago, Its still broke, I talked to them today they said they put it on the computer what came up on it was mass air flow i think what ever it was they fixed it and its still doing the same thing they are at a loss, someone told me tonight that it could be the gas cap lossing pressure. could this be whats wronge with it?
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