hI , CAN ANYONE HELP, I AMA NOVICE TO OUTBOARDS,AND JUST PUCHESED MY FIRST BOAT WITH A JOHNSON SEAHORSE 20hp .SHE STARTS OK AND SEEMS TO RUN FINE UNTIL YOU THROTTLE BACK,THEN SHE CUTS OUT AND IS VERY DIFFICULT TO GET GOING,USUALLY HAVE TO GIVE IT CHOKE,DONT THINK ITS ELECTRICAL BECAUSE OF...