It is a 1996 RAV 4 … Any idea where to start looking?
Clean the throttle body and check the manifold air fold thingy that is attached, I had one of those go bad…from a non-mechanic
If you have a code reader might try and look and see if anything shows, maybe in the freeze frame data.
If it really runs like normal, but won’t idle or idles rough, you can check this too.
What he said. Replacing it is going to the likely case, given the age of the vehicle.
BUT, I would look for a vacuum leak before cleaning, or replacing the IACV.