the engine was serviced about 7 months ago and it has been winterized with the quick kleen additive and the fuel treatment. The problem is that it will start run for about 1min. and then slowly stops, If I try and advance the throttle it doesn't respond and cuts out anyway.I did notice that the primer bulb doesn't get good and firm and the hoses has not been changed since I purchased the boat 5 years ago, can this be my problem? It appears to run fine when it is getting fuel.