The Gods have smiled on me. I found a 1986 DL that has been loved (thank to previous owner!). It just needed a jump, but idled really high. I tried adjusting the throttle cable and then rerouted to the space closest to me. This lowered idle and I attempted to turn back idle and broke the hex shaped know. Now car won't start. Cranks but won't start help me get back in the 240 game.

check your vacuum hoses,especially the hoses going through the IAC. One goes to the intake manifold, to other to the intake hose just below the throttle body.
That would be my first guess

Thanks I was able to get it started but it idles really high but in gear levels off. If I stop it wants to keep driving if in gear. And I have to keep foot on brake.?i am going to test TPS now

After hours of research and tinkering problem seems to be engine temp sensor. Beast to get to but problem solved. Now if I can pass emissions we will be on the road to restoration

Make sure the throttle plate stop screw, located underneath a lever attached on a shaft, is NOT holding the throttle plate open any at all!
It's there only to keep the plate from getting jammed in the bore by the return spring pressure or a sudden snapped release.

Pull the hose off the throttle body and make sure it's centered closed in the bore. Most of the time it's ok but you need to double check it.
It's real easy to have it letting in more air than it should. If that is happening it will be above the fully closed range of the vane in the IAC valve.

When that is done, reset the throttle position switch to "click" back and forth when the throttle plate barely wiggles to open and close. Leave a tiny amount of slack in the throttle cable between the drum and the cable adjuster bracket.
This allows for engine movement on the motor mounts, good ones or bad ones!

The black knob it not used to maintain any idle position.

When the IAC is out of the loop when grounded you might have to use it to only get it to limp run at a very low speed.

It's when you unground the IAC that the idle will jump up and be totally controlled by the IAC and ECU program of about 750 RPM.

The ECU will use the IAC to add engine power and a slight RPM change when using the A/C or an automatic transmission.
It's all a pre-programed electronic idle.

If things are set right and working, with no air leaks past the throttle plate. you cannot get it to idle to high.

Phil

The cable is not used to adjust the idle the black knob on the throttle body is.first must ground the IAC motor/valve so it takes it out of the loop but HIGH idle is usually a vaccum leak after the AMM meter so check the accordion hose leading up to throttle body.

Engine temp sensor replacement solved problem thanks!!