mine was the same way, but i never made any adjustments, it was the linkage on the pump that was moving, some extra return springs and it wouldnt climb above 1000, and now it idles right at 800 all the time.
check to see if you can move the linkage back to the resting position by hand while the truck is running, and see if the idle comes down.
IOh and another thing it was running really warm, probably almost 220-230 degress. I put coolant in until it was full. What did i mess up there?
I would take the throttle linkage off the pump and lube all the joints. You don't have to pull the radiator to change the front seal.
The twitchey thing is just part of it.
Time to learn how to drive again.....
Is that still the 24v throttle cable?
Yea roachie modified the factory 24v on to work on the p pump throttle assembly.