I spent about an hour to stop my low idle, almost stalling when clutch depressed condition on a gen1.
I removed the IAC motor. Only two bolts. I took the unit apart, only two bolts. I cleaned everything with a white cotton cloth and sensor safe throttle body cleaner. I was amazed at the dirt.
I took off the tubes. I opened the throttle bodies and cleaned everything inside making sure nothing was hanging them up from shutting.
I removed the tube going into the airbox by the IAC. I removed the air sensor. I just wiped it down with dry cotton cloth.
Perfect idle ever since.