First of all, I would like to thank everyone that has replied to this topic. All the information recieved has been very helpfull in diagnosing this. I still havn't been able to get it to start, but I have more details on the situation. The truck was driven into the shop and it just wouldn't start the next morning. We used starting fluid, and it wouldn't start. We checked the sensors and the ECU and the wiring harnesses and we still could'nt get it to start. Then, one morning for some reason I dont know, it started right up. We used the truck for about two days with no problems. Then the driver came in the next day to take it, and it wouln't start. It has been sitting for about a week, unable to start. After reading the replies on this sight I cracked open a fuel injector line while some one else cranked the engine. Fuel was coming out of the line, and there was smoke coming out of the exhaughst. I'm thinking its a timing problem, but maybe electrical since it had the problem before, but somehow fixed itself for a couple days. Any suggestions?