The check engine light on my 04 Colorado recently came on and I had my service station run a diagnostic test and it came back with a misfire code. They didn't attempt a repair because there was a service bulletin from GM about the problem. It also said the exhaust valve springs and seals could be bad. I took it to a GM dealer and they ran a diagnostic to be sure and they came up with the same code. They recommended an injector and throttle body cleaning. They did their recommendations and they said after a test drive the same thing happened. Any thoughts?
Feb 16, 2010 at 7:07 AM