I had the same problem as you mention. These were the problem my car have; sometimes stalls when i accelerate, stalling at stop light, and sometime a little stalling during driving on the freeway.
I had tried to fix this problem by cleaning the EGA valve, but no luck. I finally able to fix this problem by simply change the Water Temperature Sensor(EFI System), i found this out by reading some Toyota forum where a lot of people have the same problem with their 92-93 Toyota Camry V6. It sounds weird, but this sensor mess up the ECU which cause the stalling. The sensor itself is very cheap too, it only cost me $20 at Napa Auto parts. Save me a lot of headache any money. Hope this would help.☺
