I got called up to a shop to help set cam sensor. Crank it and it would pop and then nothing. Went through the procedure and got it set right, and it did the same think. Hmmmmmmm..........started asking questions and after about a half hour a friend of the shop (who runs a tune up shop) said "it sounds like your exhaust is plugged up. We looked at the assembler and his face turned red.......turns out he left a shop rag in the exhaust header and it was wadded up into the 76mm turbo and wouldn't let the poor engine pass gas. First time I've seen that. Lol