my mercury 9.8 110 shut off on me after about 10 minutes of running it. after it cool off it will start back up. What seems to be the problem? I have been troubleshooting the following but each of these are functioning properly:<br /><br />gas is following properly<br /><br />water pump is working correctly <br /><br />gas/oil mixture is correct<br /><br />both spark plugs have been replaced<br /><br />new carb kit has been put in it also<br /><br />could it be a coil pack or does this motor have one?