I just took my seahorse to a marine mechanic for a miss at idle. Once powered up it runs fine.They did not do a rebuild because they told me it could be 2 different things.<br /><br />The first of course was that it needed a carb rebuild.<br /><br />The second was that they mentioned a air leak or something at the lower unit which would cause it to suck air? <br /><br />Ive already given them $85 for basically just changing out plugs as it not idling any better now than before. They say a carb job would be another $125.00 but thet cant guarantee its the carb but could be the air problem.<br /><br />How can I tell if its the air/exhaust problem? Do any of you know what the mechanic is talking about and how I can check that myself to detemine if it only needs the carb job.Please help!