Two days ago, my 1994 Lexus ES300 stalled immediately after I started it. In my attempts to repair the problem, I have replaced mass air flow sensor, fuel filter, and spark plugs. I have also taken out and cleaned the throttle body as well as the IACV (idle air control valve). However, the car still stalls immediately after start. Even if I start the car with accelerator pedal fully depress, the car would still immediately stalls after starting. In short, my car is currently able to crank and start, but it would immediately stalls afterward.
Anyone have any suggestions as to what the problem might be?
P.S. A couple months ago, I replaced the timing belt and water pump. The car has been driving great until two days ago.