Spector1333

Hello,
I am new to this forum but enjoy it alot. I am having a problem with my truck. I just bought it and it has a problem with the fuel/air somewhere. It will start but you have to work at it. It will not idle. If you attemp to give it any throttle it will die. I have replaced already; idle air control valve, mapp sensor, throttle postion sensor and none made any difference at all. Thinking it may be a problem with EGR valve but not wanted to keep searching hit and miss. Any imput would be much appreciated. Thanks.