hi this is my first post on the forums, im trying to learn how it works but the reason i made an account is because my 93 f150 v8 5.0 2wd is having stumbling problems. when i get up to about 40-45 mph the truck just kinda jumps and starts shaking but only for half a second its been driving me crazy no one can figure out whats wrong with it do any of you guys have any idea?

ps: sorry for the long post

 

Check the IAC (Idle Air Controller) and the EGR valve & vacume actuator. Even if the IAC is showing no codes & providing everything else checks out ok (Tune-up, EGR, etc), replace the IAC.