1988 Jeep Cherokee Clarification on High Idle Problem - Any

In warmer weather my Jeep periodically "sticks" at max RPMs upon starting. Can be Corrected by disconnecting/re-connectiing the wire harness from the Stepper Motor while engine is running. Upon re-connecting harness idle returns to normal.

Actions taken:
Stepper Motor replaced twice
All throttle linkages checked ok
TPS sensor replaced and factory set

My questions are:
"What sensor(s) would cause the stepper motor to max out the idle after starting?"
"What sensor(s) affect the stepper motor's potion in general?"
"What component(s) relay air temperature information to the engine during start up?"

Any suggestions are more than appreciated!