I have twin 1990 johnson 150's, the problem only occurs with one engine ocationally. The engine will start up and idle fine, and can troll all day with no issues, however when i start to go the engine shakes as if it is only firing on 4 of the 6? I have changed the plugs and drained the bowls on all three carbs and the problem still occurs? I have found that if i tilt the engine to the point were the prop is about to exit the water then lower it back down that i can power down the engine for 30 sec then it starts to hesitate agian. Also ocationaly i can push the throttel down with no problems and run 30 miles then go to a idle and the problem starts agian. Agian the engine idles like a champ for 10 hours of fishing but ocationally will not allow me to go faster than idle speed. <br /><br />Any sugestion would be helpful, I am at a loss<br /><br />Thanks<br /><br />Dean
