twisted minis
+1y
Well the high idle could be the choke linkage being out of adjustment. These trucks have a water choke so it will turn on until the coolant gets to a certain temperature, and then slowly back up. Yours might be opening it too far.
As for the shit idle, I had this problem and racked my brain and many others for almost 2 months. The problem ended up being simple.
Theres a plug in the back of the carb, the name of it escapes me right now, but its not important. This plug needs to be wired correctly, or your truck will idle like shit, and die if you let the idle get down too low. Theres also a rod behind it, and if this is missing it won't do its job even if its wired correctly. Check that. One wire needs to be wired to an ignition hot, the other needs to be grounded.
Also check for any vacuum leaks. Cracked vacuum lines, an unplugged port. A vacuum leak will also make it run like ass, and idle choppy.