I have a 3 lead pacemaker. Has anyone had a problem of their heart speeding up when in a car,truck, or on a lawnmower when the road or lawn is extemely bumpy? I just had mine checked and they said it was fine, but something is'nt right! I have had mine sense July 18,2007. I go from 65bpm to 130bpm within 100feet walking at a stady pace (not a hurried pace). any ideas to what might be going on??