i have a 93 f150 with the 5.0 and a 5 speed. When i crank the truck it will drop really low rpms and then jump back up, same thing happens when i stop at a redlight if i let it idle it will act like it loads up it does this bad with the ac on. Im just really fed up with it and looking for some hep thanks.

 

check to see if your belt pulleys or belt is slipping

 

Check for codes first thing man. https://www.f150forum.com/f10/how-re...es-obdi-10907/ That is a link on how to do it for free. Post back with the results and we can proceed from there man.