I'm having the same problem - just air going through one of the cylinders... Funny thing is the plug sparks fine outside the cylinder. Power comes and goes (cylinder goes on and off periodically ) so ignition connections might be screwed. Guess I'll have to check wiring system - going to take a long time cause I have no idea what is normal/abnormal. Checked leads as far 'up' as coils - resistance as per shop manual, any other suggestions guys?
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'87 MC16