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Missing under load

jwalc1975

New member
I have a 1990 350 Sundancer with twin 454s and just starting to have a problem with my starboard motor missing. Anywhere from 2200 RPMs to 3500 RPMs it will miss here and there. Nothing constant. Friends say anything from cap and wires all the way to a cam... Any ideas???

Thanks in advance!!
 
I have a 1990 350 Sundancer with twin 454s and just starting to have a problem with my starboard motor missing. Anywhere from 2200 RPMs to 3500 RPMs it will miss here and there. Nothing constant. Friends say anything from cap and wires all the way to a cam... Any ideas???

Thanks in advance!!

Another important point is that it does not miss out of gear... Only under a load. Sitting at the dock I can run the engine up to 3200 RPMs without a problem.
 
how do you know it is NOT missing when out of gear??? The marine ground BBC cam's grind masks a lot of misfires.

I'd start with the secondary side of the ignition.
 
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