I have a 97 Merc 75 hp that has had very little use approx 20 hours . Took it out for the first time this year and started it but it will not idle and when shifting into gear it quits, to keep the motor running I have to keep on fast idle for the motor to run at all . Changed the plugs and it still would not stay running. Any simple suggestions on how to trouble shoot this problem would be appreciated before I take it to be looked at.<br /><br />Thanks<br />Bill G