So i recently put a set of headers and true dual 2.25" exhaust on my 88 dodge with the 318 TBI and it started right up and ran great right off. But when i start to drive it (put the engine under load) it instantly starts to bog and stumble. And the more i try to feather the throttle to keep it from stalling it chokes up even more and has began to stall after a few seconds of struggle. What could this be i checked my TPS just for the hell of it and its good. Could it be lack of fuel pressure?