Vacuum and surging idle

My idle is surging and I've cleaned everything; IAC, MAF, and verified TPS voltage at .98v. I haven't checked my timing or fuel pressure but last time it was done I set it to 37psi and 10 degrees. Now... if I unplug a vacuum line anywhere in the system the idle smooths out. What the heII does that mean???

I checked both leads at the IAC with a test light. One is 'hot', the second only provides ground when the car is running. Is there a way to tell if the IAC motor is working correctly?

Also, I ran codes.

CODE: 11 (KOEO) - System Pass
Engine: 5.0L
Year: 86-93
Description:
System Passes this test


CODE: 44 (KOER) - Right Thermactor Inoperative
Engine: 5.0L
Year: 86-93
Description:
Thermactor air system inoperative (right side)

CODE: 94 (KOER) - Left Thermactor Inoperative
Engine: 5.0L
Year: 86-93
Description:
Thermactor air system inoperative (left side)

Is 'air' meaning 'AIR' the acronym. Air Injection Reaction (SMOG stuff)

I just pulled these at The Corral. The list I had previously didn't specify left or right so I assumed this had something to do with the smog system. Left and right leads me to believe these are my O2 sensors. Can someone confirm this?

blk92stangg said:

...proper throttle plate adjustment. Seems like the IAC is the only thing maintaining your idle, possibly due to not enough air going by the throttle plate at closed throttle.

Click to expand...

I did notice my throttle plate sticking closed a bit when using the linkage at the TB to bring up the revs. I'm going to installed a Idle Adjustment Spacer from Ford then the throttle plate can stay closed at idle. I will clean it tonight before adding the spacer next week. Thanks for the suggestions.


TheUser: So you're saying the 44 & 94 codes shouldn't affect my idle? I did check the smog pump and its pumping air. I have voltage to the solenoids and vacuum. But, I'm not exactly sure when they are and aren't supposed to open the valves.