89 OMC 3 ltr coil question

shimano

Petty Officer 2nd Class
Joined
Jul 26, 2008
Messages
141
So I have a 89 OMC 3 ltr.switched to pertronix years ago with zero issues.now toasted 2 coils in 50 hrs of run time.( I always carry a spare now)any ideas??.can almost predict it because starts missing slightly at certain rpm and stalls at idle.
 
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