Can’t figure out what’s going on with my 1990 GMC sierra 1500 extra cap
Hello so I have a question ever since I lowered my truck from the rear end it’s been acting up as in when I start the truck it runs and drives fine but as soon as I come to a stop it starts to jump only staying at 2000 rpm if I turn it off and turn it right back on it drives fine like if nothing is wrong but later it’ll do it again I already changed the throttle sensor, idle regulator, map sensor, ignition coil , I don’t know what’s wrong. I don’t have a check engine light on either have you ever had or none anyone with problems like this and how or what got changed or fixed ?

