GM Truck Club Forum banner

2002 Yukon

8067 Views 16 Replies 6 Participants Last post by  unplugged
I have an 02 Yukon with about 50k miles. The service engine soon light came on (Flashing at first then went steady). Plugged a computer in and got code P0305 (Misfire #5). I changed all the wires and #5 plug and coil. Light continued to flash after reseting computer. Originally I could not feel any difference in the truck. Then it got progressively worse(Truck shuttering and very rough idle) I brought it to my local mechanic who put his computer on it and found multiple misfires on almost all cylinders. He checked the fuel nozzles and systems and it checked good. Has anyone have any idea's on what this could be or better yet has anyone had this problem. I am thinking it's the computer or a faulty ground. Thanks for your help
1 - 3 of 17 Posts
Yeah, that's a thinker because it's like it's spreading and getting worse. Over what time period did it gradually get worse?
ahh, you got caught over the 3 day weekend. Let us know what he finds out.
Where was the loose wire at?
1 - 3 of 17 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.