01DODGESMOKER

OK so for the last month i have been dealing with a hard start proplem so after it is warmed up it will crank for a bit then fire up. The other day it was doing it bad so i was checking under the hood and drained the petcock on the fuel filter bam!! truck fired right away took it for a drive and for about 5-6 starts and stops it did it again. so i drained it again and it started right up again? what can be causing this on the programmer if the fuel pressure is at 1 it hard starts if it is at 4-6 fires right up