03 silverado running rough
I was coming home from deer hunting pulling my atv trailer. I stopped and got gas and 80 miles later it seemed like I was down on power and the truck was kind of shaking. I got into town and when I st...
Forum Discussion
Thunderbolt wrote:
Update. I am not positive it is fixed, but it may be. I am ashamed to say the spark plugs must have had more miles than I thought. They were worn bad and instead of a .060 gap they were at .090+. I changed them and it runs great and idles smooth, but I am not positive the actual problem is fixed.The reason I say that is because the truck had cooled down and if I am not mistaken the coil packs can act up when hot. Is that a correct assumption ? It is idling smoother than it has in awhile.Any guesses on whether the problem is solved ?? I got the ac/delco plugs the dealer told me to, but the new ones are only .040 instead of .060. The dealer said they changed the specifications.
Yes, the coil packs will misbehave when hot (when they're failing). But you may have also fixed it by replacing the plugs. A few weeks ago my stepson's Rubicon had a P0302 code (#2 misfire) and after replacing the coil pack it was still there. New plugs fixed it....
