I have an '01 Dyna Twin Cam '88 carburated. The check engine light stays on/ stays off periodicaly. Dealer checked code said it was 12 MAP sensor short to ground. I've checked every wire and checked again, cannot find it. Could the sensor itself be going bad and is there a way to physicaly check the sensor itself. I cannot feal any difference in engine if light is on or off. Can this damige engine?.......Shooter