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View Full Version : Runs Rough at Low RPM Only



3rdDonzi
04-27-2007, 07:57 PM
My 18 Classic (350 Mag Alpha) after warming up runs rough at low RPM, accelerates normaly and runs perfect at speed, however when coming off of plane around 1600 RPM and below gets extremely rough. Sounds as if all eight aren't firing. Boat was previously in Colorado. Now close to sea level. Also a little more than normal soot on transom after each use.
Any ideas? Thanks,
Corky

mrfixxall
04-27-2007, 08:25 PM
install a new set of spark plugs,check the choke and see if its closing on you and throw some octain booste in the tank and a can of seafoam wouldnt hurt either..