cylinder 1 and 7 show misfire on a 04 GMC 5.3.

Question

motor was replaced, computer is showing misfire in cylinders 1 and 7.

Answer 1

Hi there,

Here is a list of possible causes for a misfire.

P0301 GMC - Cylinder 1 Misfire Detected

Read more: https://www.autocodes.com/p0301_gmc.html