1999 GMC Yukon Rough Engine

1999 GMC YUKON
130,000 MILES • V8 • 2WD • AUTOMATIC
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99YUKON!!
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Hello. I have a 99 Yukon with about 130000 miles. Check engine soon light is on, message indicating 4 cylinder misfire and O2 censor. I have replaced all spark plugs and wires and one of the O2 censors (can't get the other one off). I have also replaced the air filter. Engine is running extremely rough and shakes the car when idling and also when driving. When I hit about 35mph check engine soon light flashes indicating a misfire. I don't know what else to do to fix the shaking. HEEELLPPP!
Feb 20, 2008 at 2:11 PM
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2CARPRO JACK
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CPI injection? im gonna say it is a bad injector.Those engines had alot of problems with them. When you go to replace it, might want to do the fuel pressure regulator too, it is under the intake and they had problems as well
Feb 20, 2008 at 2:17 PM
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ALMITEE
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Hello, I have the exact vehicle with the exact problem. I just wanted to follow up to see if the solotion resolved the issue?
Mar 3, 2008 at 8:56 AM
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