My 1995 Toyota Camry (4cyl.), which only has about 43K miles on it, has been having a weird problem. The engine started stalling, but only after I had driven at least 15 miles on the freeway and then was slowing down to stop at a red light or stop sign. As I got closer to a stop, the engine died, but it would restart fairly quickly. But it would then stall every time I tried to stop, unless I gave it extra gas. It ran perfectly well at all other times. My mechanics, who I think I trust, replaced the IAC valve and the thermostat. It then ran fine for a few months, although I had not driven on the freeway much. Then a couple of weeks ago, after driving more than usual (and thus getting the engine nice and warm) on city streets but in traffic, the engine stalled again, same scenario. I took it back in to the shop and they could not find any problem other than a lot of rust in the radiator. The radiator had already been flushed and refilled 3 times in the last year and a half. So I am wondering if the stalling problem is related to the rust problem and if there is anything else the mechanics should be checking. They just told me to wait and see if it stalls again. I had done some preliminary research when the problem began and the only other thing besides the IAC valve that came up as causing stalling only when the engine was warm was the EGR valve. But I do not want to get anything else fixed unless I feel pretty certain this will fix the problem. TIA for any replies.
I do feel confident that the IAC valve was a valid diagnosis, and replacement. A faulty EGR can cause those same drivabilty concerns as well, EGR is the acronym for exhaust gas recirculatory valve, and if it becomes stopped up with carbon deposits it can cause the car to stall at idle.
They may be able to remove it and visually inspect for blockage before sure replacement.