I have an 88 ford f-150 with a 302 in it. My problem is that when I am pulling something or if I am just getting on it the motor seems to stall at a certain rpm(don't have a tach so I can't tell you what rpm) or if I am driving down the road and the transmission kicks down it sits and doesn't speed up(actually slows down) the motor doesn't power up just seems to sit there. I have changed the IAC, TPS and taken the throttle body off and cleaned it real good. put new fuel filter and both fuel pumps and this still does it. The engine light comes on only very periodically. and it starts kinda rough but after it starts and if I'm just sunday driving it, it runs great. any help would be greatly appriciated