I think I have 2 problems, I don’t think they are related. Fist the truck iddling at about 1200, then you step on the gas to bring the iddle down and it stays at about 3000, you can slam the peddle again and get it back to about 1200, but it should iddle at about 750. Got any ideas? When the same truck is at operating temp. you put it in drive and the oil preasure drops from about 40 to 20 and if you stop at a light or stop sign/ run it to long the oil presure goes to 0 and you start hearing the lifters knock. Got any answers? BlastedCar
If your oil pressure is dropping to zero I wouldn’t sweat the fast idle problem! Sounds like you have some major engine wear issues.