what the!!!!??????

Yes ... the hanging idle can arise out of nowhere
but
There really are some reasons it can happen

The pcm will keep the idle a bit high and it is based upon speed that the
VSS sensor outputs to the pcm.

First and Formost ... Learn from the dizzy thing you just did :Word:

Get data B E F O R E making a change
cause
This give you a baseline or reference point

First thing I would do is ......

1) count the amount of turns it takes you to gently seat the tb bleed screw
2) put it back to its original setting
3) report back to us that amount

Grady

Before you drop $600 on a no-name tuner (get references) from actual customers. I say this because for $50 more you can get an SCT 4 position Tune AND a wideband which is a GREAT tool all from www.lasotaracing.com Don is a great guy to deal with.

I had him setup up a temp tune on my 331 Trickflow engine with 42lb injectors and a LMAF meter. Fired right up the first time. All by mail. After some datalog on the wideband, he's getting even closer on a great tune.

I chose this route for the main reason that I don't want to learn by trial and error how to tune my own car. He's had a lot of experience with 94-95s (picky computers) AND if things get REALLY bad, he is within towing distance of me. Granted I would have to drive across two states to get there. But the good news is I haven't needed to. AND I have a wideband that I can use driving down the road. If I move the timing, I can see the Air/Fuel Ratio changes. Which is a great thing to have when I get to hit that bottle again.

Maybe your friend did some work and was slick about it.

Also, his Cobra already has basically what you installed. Why would it outperform his Cobra?