Ok i have a 98 k1500 5.7 vortec. Ok so here is what is going on. I put a new plentum and intake gasket on my truck and now it will not start. The only way i can get it to start is to advance the timing by 1 tooth and unplug the tps. If i advance or retard the timing at all it will not start. I have checked the tps and even replaced it, the old one and new one where both good. I do not know what to do. When the truck is running and you plug in the tps it dies immediately. Any ideas would be great. I need help bad!!!!!!!