Just trying to figure out a good place to start on this one. I have a 1999 125hp Mercury has one annoying problem. It will stall when cruising for a while (5 minutes) at idle / low speeds. It will not restart after it dies for at least a 5 to 10 minute resting period, after which it will usually fire up as if nothing happened. The engine runs strong at higher speeds and has a nice idle. There are no other noticeable problems with this motor. <br /><br />Also I see that impeller replacement is a recommended as a preventative measure. Is this necessary in freshwater, if so how often?<br /><br />I have minimal marine engine experience, but I have pretty strong automotive experience and electrical background. I have not had the opportunity to check for spark when the motor is dead in the water, but that is the direction I am headed in. All comments are welcome!
