will do. when this problem first started, I used a MAP sensor cleaner to clean the MAP sensor. I then used Amsoil Power Foam to clean the throttle body although the amsoil power foam can was probably over 20 years old so the can did not fully empty.

After those two cleanings, the engine definitely ran better then after about a week the car began gagging at idle. I then threw in a half a bottle of Gum-Out into the gasoline when I filled up.

I am still considering switching to ethanol free gasoline though. I will try cleaning the Idle Air Control Valve as you suggested.