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no dice. I changed the plugs and checked the wires

Ok gang, I have a rough idle in my denali that seems to keep getting worse. I've had it to the dealer 2 times now. The first they suckered me in to getting a fuel system cleaning that I thought was what they consider a "top end cleaning". They basically just dumped fuel cleaner in the tank...

Had a humming noise in my 07 yukon denali that started at 55 and continued to about 80 then would vanish. vehicle had about 35,000 on it when this started. Dealer told me it was an unbalaced tire, etc Blah blah blah. I continued to drive it and the condition got worse. Had a friend look at it...