New to this forum stuff. I have a 91' f150 4x4, 5.0 litter. I have developed a stutter on the hwy exspecially when using the cruise control, going into a slight head wind or slight rise. I have had the plugs, plug wires, fuel filter , cap and rotor, air filter, fuel tanks ,tranny fluid & filter all replaced, plus I have run plenty of injecter cleaner, no change. It almost feels like the choke (if this was carbed )was not opening or it suddenly developed a miss. It has plenty of power if you stomp on it or take it out of overdrive. Could it be some type of air flow sensor or throttle position sensor ? thanks to eney for the help. I need it!

 

It may be converter shudder. If you change the trans fluid get fluid with anti shudder of an aditive that fixs trans shudder. our possible causes plug , plug wire, egr valve. good luck

 

thanks for the help . Could it be the MAF sensor? thanks again for the help.

 

just a thought but i have a 90 f150 with dual tanks had a simaler problem ended up being the paper fuel filter in the canister on the frame rail under the cab.dealer told me it was unservicable.