The idle bounces when that sensor is plugged in. When I take the plug off it goes away. Then it idled up to 3k. So I plugged the sensor back in and the idle went down to 2k then bounced repedidly up to 3k. I took the plug off again and it just went back to 3k. A little hard to follow if you weren't there but I have a feeling it's that sensor. Not totally sure though.