Is the car tuned in any way? There are several idle dashpots that may be corrupt/incorrect. A good tuner can fix a hanging idle in less than 5 minutes.
OK as per the suggestion by wmburns I did the reset when the rain let up. I set the idle with the IAC unplugged to where the engine would just barely idle. At this point there was a hairline gap between the stop screw and the throttle plate arm. So the TP was completely closed. After finishing the reset car idles great at no load and at full load.
So I take it for a drive. Problem still persist of climbing RPMs in any gear at any speed when clutch is depressed and car is in neutral. RPMs will only drop from 2500 to 750 once care has reached complete stop for 3 seconds. I also want to note that on a flat stretch of open highway I can have the car in 5th gear and my foot completely off the accelerator and the engine will retain an RPM of 1400 and a cruising speed of 47 MPH. It held like this for 2.5 miles until I had to break due to upcoming intersection.
WTF?!?! It really maintained 47 mph for 2.5 miles. That's insane.
^^^^^this is a clue to the problem. The idle screw needs to be backed off even more but all physical adjustment is gone.I set the idle with the IAC unplugged to where the engine would just barely idle. At this point there was a hairline gap between the stop screw and the throttle plate arm.
not sure why the idle stop screw would need to be backed off further, since the TB arm can not physically go past the point it was at when I set it the last time?? I have a Predator tuner and am not sure if I know if it can be used to get the information you suggested. Thanks for the link as well, but it's not working.
I really think a vacuum leak is what the root problem is.
Does the service center have a Ford Master Tech on site ? .
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