I just recently purchased a 1997 GMC Yukon with 50,000 miles on it. Since the day I bought it, it has had a recurring problem. Most of the time it drives great, but sometimes it starts chugging when I slow down to stop for a light or when I start accelerating. The "Service Engine Soon" light also comes on. The dealership tells me that the computer says it is a "Misfire on cylinder #5," but they don't know what to do about it. They can't pinpoint the problem. It could be any number of things. To me, if the mechanic was worth his salt, he would be able to figure out the problem. Anyone's advice on this problem would be greatly appreciated.
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