Ah, nice...thanks for the tip
I saw somewhere online a company who makes a drive by wire replacement for the IAC stepper motor....intended for aftermarket Ecu's, but maybe would work with factory?
Food for thought. Thanks again.
Did this ever get resolved???
I just bought a 94 ls400 w/181k On the clock, and I am having the EXACT SAME problem.
Replaced both coils so far, hunting down air leaks now. Let me know!