What should i do about a stuck full power screw, the lock collar came off fine, and the nut turns but can't get any tool to turn that sucker back there...it feels like it's frozen from overtime...it's a 91' intercooled truck with 260,000 miles on it...and without an AFC spring it smokes just a hair.. ...

 

I was able to get at mine on the 93 with a small 6mm? open end on the lock nut and a 1/4 drive with some extensions and on the screw itsself,also 6mm i think. you gotta work it thru the backside between all the gizmos and linkage