I would try swaping the computer with yours. Make sure that the wring harness for the rear of the truck is pluged in.
strange that the shop you took it to make it lose spark and fuel. I am only getting started to under stand the 3.0 set up, wish I could tell you more!
PZ
trust me, the more you get to know it, the more confusing it is
![hahaha :hahaha:](https://board.marlincrawler.com/Smileys/marlin/hahaha.gif)
I did have a spare computer laying around, not sure whether or not its good, but I let him borrow it to see if it helps. We'll see what happens.