IMHO, I think you are best to take the truck to the shop that diagnosed the pump. First off they nailed down the problem, second if it comes back to be a pump, it comes to nothing. Or shouldn't anyways.
I get the feeling you probably aren't going to trouble shoot this yourself. We can spend a lot of time talking about the possiblilities, but I think it will be moot.
I apologize if I seem blunt, and would be glad to help out if you are going to trouble shoot. I expect this to be a loss of spark in some form. Checking the codes at this point should be done to start off.
Monday, August 10th, 2009 AT 7:00 PM