After working on the problem all day I found this post:

Now, another problem, and maybe one that people forget to check. As I already stated, I'm running a bored out TB. When the machine shop fitted a new throttle plate, they did "okay" but there were some gaps around the edges letting a little too much air through. Funny thing is I've been running this set-up for over a year with no trouble. For some reason it now wants to rear it's ugly head.

So, I filed down the spots that were too far extruded and not allowing it to fully close. I now have it to where it's as sealed as the other TB is that I have on hand. I then realized that in my case the linkage that connects the TB to the throttle parephenalia on the side of the intake plenum needed to be shortened slightly to allow the throttle plate to fully close. I noticed that the idle would stay in the 1400-1500 range unless I put pressure on the external throttle linkage, forcing it closed. Easy fix, and now the idle stays around 1000, which is plenty acceptable to me. But I wish I wasn't maxed out on the low side of the idle adjustment screw



So, I know I mashed on the throttle several times with that rubber piece bound up in the throttle plate. I have a feeling I bent the plate, how can i tell for sure and how do I fix it???

Desperate...