That is interesting....I'm having an off idle vibration problem on my 92ZR1 & it was suggested to me by a member that the TPS could be the problem. Its my understanding that theres a carbon track inside the TPS itself & sometimes the track wears thin where it shouldnt be. Its like a rheostat (dimmer switch) & votage decreases with throttle position.

The area on the TPS where the throttle spends alot of time can wear thin & cause a false voltage reading to the ECM in turn causing a miss at that position.

I am working on getting a scanner to see what the readings look like.