My car ran out of gas, and ive had a problem.

My car ran out of gas, and ive had a problem ever since, replaced MAF, MAP, Throttle position sensor, and Idle control valve the car runs great starts right up from a cold start, but after the engine is warmed up sometimes it will start without a problem, but more times than not when I try to start it up from a warm start the car will start, but cut right back off it idles down and I have to hit the gas to keep it running long enough to get in gear and then its fine again doesnt cut off or anything I took it to a couple repair shops they scanned no trouble codes, and no ideas on what the problem may be, I was told it could be a crank sensor or a camshaft sensor, fuel pressure was tested and it was about where it was suppose to be im just trying to get a idea of what it could be before I waste more money on sensors that I didnt need