I just got drug into trying to fix a 02 Silveraldo 4.3 to 4.8 swap and have ideas but don't really know where to start. Here's a little background on whats going on. A coworker of mine had his truck swapped over for a 4.3 to a 4.8 by a local shop (that didn't have a clue on how to do it) well when he bought the engine he got everything with it, engine harness, engine computer, instrument cluster, new fuel pump, he's spent so much money on this truck he could've bought a v8 truck but it's too late for that. The shops had it for 6 mo's and still havn't gotten it to run. So he ended up taking it to the dealership to have a new computer installed well now it starts (when sprayed with starting fluid) but will not run can someone give me some ideas on what to start checking? I know the first thing to check is fuel press. Is there a way to check the cam and crank sensor to see if they're bad? I havn't had too much dealings with trucks this new but I have done alot of work on the older trucks.

Any help or suggestions would be greatly appreciated to help get this truck back on the road.

Thank's