My truck started acting like it wanted to stall while driving?

My truck started acting like it wanted to stall while driving, then it started to stall but would start right back up, I thought it was the crankshaft position sensor since that went out on me before. Replaced that part and a couple days later it would not start, had a guy jump my off and it started right up, so I replaced the battery, the very next day would not start again. The truck would crank but not start, checked for fuel in the schrader valve and very little came out. Replaced the fuel pump and the fuel filter, still no start. Left it alone for a couple hours then checked the schrader valve again and this time fuel shot out of there, tried to start and it fired right up, did this a couple times and worked perfectly, drove to the gas station put gas in it drove back home and shut off, started fine. A little later I started it to drive to my uncles house and it started, put it in reverse and it stalled, now I am back to crank will not no start. Please what do I check next?