Try rebuilding the TBI, the diaphragm in the fuel regulator leaks on these and clean out the IAC orifices. It is really easy, the hardest part is getting the diaphragm screwed down while holding the spring.
Here is the kit:
https://www.autozone.com/fuel-delive...82053_821751_0
YouTube:
https://www.youtube.com/results?sear....3+tbi+rebuild