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Discussion Starter #1
OK, here is one for you. I have an occasional running problem on my 02 5.3 Yukon 85k miles. The problem only occurs about half the time and I can't figure out what it is. Here is the best way I can explain it.

Most of the time ( a little over half) the Yukon runs great. smooth idle, responsive throttle, and great power. The other part of the time, idle is a little off, power not all there and throttle response not great either. I have tried to place it to the weather or gas. An example was Thursday, I drove to work and the truck was running bad. All the bad symptoms were present. I get in on Friday, and it is running like brand new! The temperature was the same on both days and I am on the same tank of gas.

I have done sea foam, throttle cleaning and it didn't make much of a difference. Has anyone else experienced this problem??
 

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Any check engine lights come on? It could be electrical as my Wife's Suburban seemed to have a problem similar to that and it was throwing random mis-fire codes. Ended up being a bad coil pack. Never happened again since the replacement.
 

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Discussion Starter #5
Just a heads up, I changed my spark plugs and wires a couple of days ago, and the truck has run great ever since. Not sure if this is a fix, but it looks good so far. I went with NGK TR55 copper plugs for $2 each and Duralast plug wires. Either way, the idle has smoothed out overall and I hope this is a fix.
 
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