Just had my mariner 25 serviced, carb clean etc... First time I took it out it ran beautifully. However, the second time the idle was very rough and at low idle the engine cuts out. Just had it running in garage, same problems and also the water in the bucket became very oily and dirty. Also noticed a small pool of oil/water under the prop. Could this have been caused by using old fuel?...Any suggestions please!<br /><br />Thanks