Well this is my first post here and untill today I had no Idea a place like this existed. Anyway on to my current problem. My 93 ranger 3.0 has been cutting off. It will idle fine for 10 to 15 seconds and then will began to run rough and then cut off. It also cuts off if I give it alot of gas to try to keep it running. This is what I have already tried: changed fuel filter, changed plugs and wires, changed coil, cleaned mass air flow sensor, changed air filter, and changed the IAC valve. I don't know what to try next so any and all help is appreciated.

Thanks
Nathan

look like a IAC defective