Hello, I have a 17hp Kaw with 380 hours on it. I started it up and it seemed to only be running on 1 cylinder. So i put new plugs in it and that did not seem to help. So i thought that i would try to run it as is. With the blades engaged and full throtle, it will only turn 2600 Rpm's. After a few minutes though it will suddenly go up to 3500 Rpm's without doing anything. I thought that it could be a bad spark plug wire, however i am not sure. If anyone has any suggestions please let me know. Thanks for you assistance.