Fixed my truck ...it was the fuel pump! ...it humms and provided enough pressure when cranking that the the fuel pressure tester said it was ok!!!! Pulled it out, and put in a new GM pump,.. problem solved...Weird eh? the pump Ohms out just fine at 1ohm....but DOES NOT WORK!(well enough to provide "running Pressure".
-Just something to think about when you have a problem..
Jolee.