this actually reminds of something that happened at work. One of our Trucks a (99 Dodge Ram 2500) would not start ... and somehow the shop manager at the time diagnosed it with a bad engine .... so they swapped the engine and guess what .. would not start with the new engine .... so now they were taking turns throwing mechanics on this truck to figure out what was going on with it and why it wouldn't start... so now it was my turn... go updated on what was already tried so i went to go pull the o2 sensor ... and the manager was *****ing about it ... :You don't need to do that, that won't do anything .... but I did it anyway and boom started right up ... lol