I have a 99 gmc jimmy 4.3 v6 that I drive daily. I just had it inspected and past but my problem is the truck hesitates and spits and sputters while I excelerate. It has a new fuel pump, fuel filter, plugs, wirers, cap & rotor, throttle positioning senser, and mas aiflow. now when I unplug the mas air flow while running and at idol should it idol up but it doesn't. I also checked for vacuum leaks and I have none. douse anyone have any other idea what could be wrong. no codes either

 

thinking fuel injector leak. Have a fuel pressure test and leakdown done. Also make sure the plug wires are in order