mustang 1990

  1. D

    Engine Wont idle and light backfire

    I have a 1990 5.0 ho that won't idle for nothing and keeps lightly backfiring . It has new plugs,wires,injectors,distributor cap and rotor,fuel pump . The engine is slightly modded with e303 cam upgraded rocker arms and bored .40 over. I have messed around with the distributor and found good...