My nephew bought a Mercury Mark 58a about a year and half ago. He has been running it every weekend since with no problems. It's mounted on a 14 ft runabout. (He lives on the water and really enjoys his boat)<br /><br />Lately, he has been having a problem with ignition and has been unable to use the boat. The motor will not idle and a timing light indicates no spark in the bottom 2 cylinders. It may have spark in these 2 at higher RPM. Tried changing the condenser but no luck. He does really have the money to guess at the distributor cap. ($82) Any ideas would be appreciated. <br /><br />THANKS,<br /><br />BigDawg<br />Wisconsin