I have a 1991 420 SEL. Got it last year (2001) and for the last few months, on occasion, have noticed a soft, steady vibration in the gas pedal (intermittent). Sitting at a stop light I put my fingers on the gas pedal to confirm that it was really there and wasn't my toes tingling (no, I didn't have a young lady in the car with me at the time). It is not bothersome but it IS a mystery. ANy ideas??????

Thanks.......

Bob Irving
Charlotte, NC