Renix High Idle, and I have a TPS question...

My TPS is about a year old, set to spec on my 88 4.0 AW4. As of yesterday, I have an intermittent high idle problem, at startup, warm or cold. I took out my IAC and cleaned it, it is also a year old, and when I cleaned it, I cant carefully pull or push on the plunger...it seems stuck, but is that normal???

And I also read that when the TPS "arm" is pushed while at idle, it will stumble the engine.

When the idle is normal, I can push the arm and the idle will stumble.

BUT when the idle is high (2500) I can push the arm, and the idle will not stumble, it will continue to stay at 2500.

Also when the idle is normal at startup, after a few minutes of driving the idle will go to about 1200rpm.

Grounds by dipstick are clean and not broken, no vacuum lines disconnected, any help would be great.

Had a spare IAC, and idle is restored to normal speed now. Everything is 100%

The pentel (sp?), or plunger as you callled it, should not be pushed or pulled, it is threaed in and out by a rotary screw motor. If you force it by pushung or pulling you can ruin it permanently.