Nitrofan16
New member
I have a 1988 Cris craft with a 4.3L & an omc drive. Boat runs great from idle to 3000 rpm then starts popping and studering . When you put a timing light on it you can watch the spark go away. Seems like the slower you rev it, the longer it takes to lose spark but never rev's above 4000. I used to run all day at 4600 rpms. What am I missing ?