Just put new crankshaft sensor on. Why wont my truck crank everytime I turn it? on 1997 Chevrolet 1500 Pickup

I can get it running, cut it off and on a few times and then nothing. It will turn over but not crank. Timing is good and aligned, its getting fire. Put new distributor cap on. I have put a new throttle body on. What can it be?HELP!!

Sounds like you getting close, what is your fuel pressure (key on engine off) then what is your pressure after you turn the key to the off position?