TTMotorsports
Red Skull Member
Ok so I have a 1989 bronco with 302 4 speed manual. It revs and runs fine in neutral sitting in my shop. When I drive it I get a misfire when I get fast enough to shift into 2nd gear and I hold steady throttle until 3000 rpm than runs smooth until I shift again. Does same thing misfires even worse in 3rd until above 3000 rpm. I can't drive in 4th because misfire is bad and I lose speed where I have to downshift to maintain speed. I have installed a new rebuilt motorcraft 2150 carb from gaurenteed carburetors. New cap rotor plugs and wires. Fuel tank dropped and cleaned spotless. New pickup tube and new fuel filters. Fresh tank of gas. What should I check to figure out why it does this and fix it so I can drive it on the highway, get it smogged and than sell it.