backfires, lack of power while driving
I have a automatic 5.9 96 1500 4x4 I recently purchased. While try to get up to highway speeds it backfires, has lack of power and acts as if it wont change gears. Once i get to 70 and hold that it seems fine. The moment i slow down it will backfire and lack power. The rpms will be high and the truck wont speed up.
I have bought and changed the distributor cap, spark plugs and wires, crank position sensor, throttle position sensor, coolant temperature sensor and no change in performance