Iac Blues...

First post but nowhere near new. I've been lurking for quite sometime. Im in a bad spot guys and I need your help!! Here's the deal....

I've had a surging idle and gurgling sound coming fr my intake. My knowledge tells me IAC (you can pinch off vaccum and it stops gurgling). I replaced this thing with 3 different IAC with terrible side effects. They are as follows.

High idle followed by engine stall/die.
Horrible horn sound.

I looked intO the intake port of the IAC and all the new valves have a spring loaded plunger type thing, my old one does not. I also noticed Ford lists two iac for my car...are they different???

I really need to get this thing going as its my daily driver. I have re-installed my old valve and it just has a slight gurgle and fluctuating idle (200-400 rpm fluctuations).

The gurgle started intermittently and is now consistent. Car is stock except for 150 wet shot and programmer. I have returned the tune to stock for now. I've cleaned the IaC with the same results.

My computer reads nearly stoich with old IAC and with new IAC it reads +32 ST FTRM (both banks).

Help!!!!!!

It is a 2003. No vent. The tune has been completely removed from the car. I've been motioning fuel trim with a OBD scanner. The restriction box is still in Place.

What else could cause these symptoms? I have wet down the engine bay with starting fluid to rule out vaccum leaks.

I did notice some fresh oil in the intake-PVC tube. Could a bad PVC cause this?

Not a large amount but noticeable. I've pulled the plugs and they show no signs of oil/wetness.

No CEL either. I'm hesitant to buy a 200 dollar Motorcraft part when it may or may not be my problem.

Installed new Motorcraft part, engine runs great.