Thanks guys, I'll give the flush a shot. A local person on craigslist happened to be selling a Range Technology AFM disabler for a good price so I grabbed it today to give it a try as well.
Just joined after picking up a 2007 Yukon 5.3 It's got 228k on it yikes... It has tick comes from the drivers side valve cover area only after highway driving. I can let it idle or stop and go traffic for 30 minutes and it runs beautifully. Once warmed up and on the highway for a while it will...
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