starting problems

have 1994 trooper LS with 3.2 DOHC. finally got the thing to start. and on cold start in the morning it will fire right off, fast idle up just fine and then die a few seconds later, will restart but have to feather the throttle and it will run like crap and pop thru the intake, sounds like timing but for the fact it runs fine for the short time on first start up. question.. could the fuel regulator valve be the culprit??? or that throttle positon sensor or both? really have no idea. first isuzu we have owned.:shakehead