yeah, i had to literally bend the throttle blade back to where it wouldn't let air in. i don't know how a throttle blade gets bent in the first place though.

 

I don't know if this helps, but I went thru all of this and my idle issuse turned out to be one of the return springs on the throttle was not working. It would run for weeks with no problem and then this strange
high idle. Lots of parts, trip to dealer (who screwed the base idle all the
way down) who only made it worse. Make sure the throttle is hitting the
stop.