1999 GMC Yukon Rough Engine

Tiny
99YUKON!!
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
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!
Wednesday, February 20th, 2008 AT 2:11 PM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
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
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Wednesday, February 20th, 2008 AT 2:17 PM
Tiny
ALMITEE
  • MEMBER
  • 1 POST
Hello, I have the exact vehicle with the exact problem. I just wanted to follow up to see if the solotion resolved the issue?
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Monday, March 3rd, 2008 AT 8:56 AM

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