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Old 01-12-2013, 07:45   #25
The Fed
Senior Member
 
Join Date: Dec 2012
Location: Central Florida
Posts: 707
In-laws have an older 4.2 Yukon with port injection. I'm guessing they drove it with a leaking injector. I figure this because their other cars constantly misfire and they think they run great, and they ignore CEL's. Anyway, I'm thinking so much fuel got past the rings they destroyed the engine (fuel in the oil). So always be aware of how your vehicle runs.
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