Possible tranny damage?

Ok, no luck with the idle. Let the car warm up and went to adjust the idle since it was obviously running fast. I backed the idle screw off as far as it would go, until it wasn't even contacting anymore. All this resulted in was the screw turning, no change in throttle position it remained right where it was at and didn't slow the engine at all. At first I thought it might still be stuck on fast idle but it doesn't seem to be.

Only thing I could think to try was adjusting the mixture which resulted in it running like ****, as I expected.