boatyard13
Member
Help is always appreciated.Have a 93 Mercruiser 4.3 Alpha One Thunderbolt. Idles beautifully at 650-700 rpm. First thought was bad gas. Pumped fuel tank dry of very cloudy/watery gas and had carb rebuilt. Still cuts out on earmuffs and on water. Timing light showed Timing so retarded, it wasn't even on Timing bar. Advanced Timing at 8 before TDC and rpm jumped to 1000+- on low ram scale of Hawk diagnostic tuneup analyzer. Attempting to lower idle screw, brings idle screw out of contact.