HAVE A NEW 2001 MERC 115, 4 PLUGS USING NKG. I THOUGHT IT WAS THE BREAK IN OIL BUT NOW THAT ITS GONE AND I HAVE CHANGE PLUGS I STILL HAVE NO TAKE OFF POWER. AFTER I DO GET ON PLANE AND GET IT WARM IT SEEMS TO RUN FINE. HAVE TO START OUT SLOW TO GET IT GOING, OR IT BOGGS DOWN AND WILL NOT...