Random stalling

Just a few weeks ago around the time the weather started to get hot, truck will randomly stall. Only seems to be when it is warmed up. There is no consistency in the stalling, could be at highway speeds just cruising, or while accelerating or slowing down, and also at idle. Usually takes a long crank to get it to start after stalling, maybe two or three five to ten second cranks. Only slight power loss on the front fuel tank at slight throttle, not enough to have any issues getting up to speed in traffic. Back fuel pump is bad and has been for awhile, have not been able to get my hands on a fuel pressure gauge yet due to lack of money after bills and all. So just wondering if anyone may have heard of the problem and may be able to single it down a little or know if it is fuel or a overheating sensor maybe? Considering the lack of tools. Thank you.