Honestly, I had a service mechanic look at it, while it was throwing the Code, and he too is stumped because the Truck shows no phisical signs of missfiring. It idles Great no visable misfires. Napa guys came out and also no visable misfires. There only suggestion was to take it to GM and let them play with it on a dyno machine to hopefuly detect the issue.
Monday, July 2nd, 2012 AT 9:00 PM