I HAVE A 1981 MERCUISER 120 HP. MY PROBLEM IS IF I PUSH THE THROTTLE DOWN FAST THE ENGINE,HAS A BIG HESITATION OR IT STALLS. I'VE PUT ALL NEW PLUGS POINTS CONDENCER ROTOR DIST CAP GAS LINE FILTER, I CHECKED THE CINTRIFICAL PART OF THE DISTRIBUOR THEY SEEM [FREE ETC] OTHER WISE THE ENGINE...