I measured the resistance between pins 1 and 2 (the top two) on the AFM potentiometer. At rest the resistance is about 1.8-2k ohms, then it increases to about 3k ohms as you barely move the plate down. Then there's a dead spot (resistance goes to infinity) after which the resistance moves from about 5k ohms all the way up to 14k ohms. At 14k ohms the plate is still not all the way down--as I push it down the final portion the resistance decreases from about 14k ohms to around 9k ohms.

All these values seem far too high, and then there's the dead spot. But I've heard people say that you can't really test the pot on the car very well. What do you think? It seems like a PIA to replace the pot, so I only want to do it if it's very clearly the cause.