My 2001 GP started stalling at slow down and or idle. Just got it back from the fixer man. They put in a new IAC valve, showed me the old carbon coated one. Drove it less than 3 miles, and it stalled again. Took it back, typically, it would not stall with the mechanic with me. I asked if the valve had to adjust itself to the car. He said that's why he had test driven it twice after the install. Does anyone know if this is correct that they have to learn?