1996 Isuzu Rodeo Repair Question
It sounds like the IAC is still not working properly. Check wiring to it to make sure nothing is damaged or corroded. Also, you may have gotten a bad one, so you may want to take it back for a new one again.
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I agree with Jacobandnickolas about the IAC.
Did you adjust the base idle?
Did you check the coolant level?
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