Thanks to those who have replied to my post and have similar questions. Mystery not solved yet, but we're trying. Question: How many of us who have this problem also have cruise control engaged when this happens? I hadn't thought much about it, but I'd like to know. Maybe we can find a common thread......

Related topic: Occasionally while riding down the highway with cruise control engaged, I notice a slight, erratic in-out movement of the gas pedal.(I've confirmed it with my fingers). Although the speedometer needle stays rock solid as it should, I feel slight, erratic acceleration/deceleration.. -- not enough to make a big deal out of, but just curious....

Thanks again...best regards

Bob Irving
Flight Instructor
Charlotte, NC