I have 1978 80hp mercury and i'm not getting any spark from #3. i pulled #1's plug wire it sparked and also the motor died. the same happened with #2's. however, #4 the motor stayed running, it did have a spark though. #3 had no spark and the motor stayed running. I did a compression test and they were all at 60 I was wondering if there is some kind of formula to figure it out or do i have more troubles than i know. would appreciate any help i could get. Thank You.
