HELP!!!
My '91 F350 has a inconsistent hiccup while at cruising speed and just started doing the same thing while accelerating from a stop. I just did a tune-up two weeks ago. Plugs, wires, cap & rotor and air filter. The truck runs strong and even idles fine, but that hiccup is bothering me. Is it tranny related or what?

Thanks,

64STAF-FORD


88GT, 90 F350 Centurion, 91 F350 CC Dually

 

Pull the codes and see if anything is there

 

well if by hiccup you mean it is cutting out i had the same problem of my 89 bronco and after pulling the codes and changing everything imaginable we finally replaced both fuel pumps. now it won't cut out and it runs perfectly.

 

Check the alignment of you plug wires. I had a problem once where I was getting cross fire. I forget if any of the wires should be crossed or if they could not cross.