Hey guys my 1980 Evinrude 140 hp shuts off when i put her in neutral, i have been fixing this boat and haven't gotten a chance to put it in the water just yet. I can open the throttle and start her up and drop the rpms down slowly but once it gets to neutral it idles between 700-800 for a couple of seconds ( around 10 seconds to be exact) and then dies, what could be the problem?