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This car never sees wet weather or winters. I was also unable to set the timing at idle, had to set it at 3000 RPM at full advance and it takes a few seconds to settle down at idle. Also the timing jumped around (38-40 degrees) is that normal?
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While outside weather does have some effect on your ignition system, the inside corrosion is caused by a sealed cap.... Everything is outside temp, you start the car a drive around, things heat up, pretty hot under the hood, you come home and shut it off, things cool off, condensation occurs, and that's where the corrosion is coming from, drilling holes in the cap will help........
My timing doesn't really jump around, but does take a few seconds to come back to the idle timing setting once idle rpm is reached, my guess is corrosion will do this also as the weights have to move over rusted metal........
Why MSD doesn't spray the bare metal parts with some type of shelack/sealer before assembly is beyound me........I've seen other factory distributors such as the Duraspark unit that have all bare metal parts coated!!!!!!!!!!!!!!
David