Check engine

I really wish I could have hired some of these "key board" mechanics when I was a dealer. It is amazing how they know more than a trained mechanic all with a description on the internet without even being in the same State as the truck. How do they think the mechanic working on it made the diagnosis...he read the codes. He installs a new computer and it either fixes the problem or not. If it does, pay the man and go home. If it doesn't, they can't charge you and then they need to go back to work. Simply make the agreement before they do the work. If you can't afford the repair, keep driving it until it stops.