Rusted MSD

Hi, the last few weeks my engine has been dropping one or two cylinder when I first start it, didn't matter if it was the morning or afternoon. When I drove it for a few miles it cleared it self and on I went, thought it was a plug on its way out. It only gets driven probably 4 times a month.
I finally had time for some maintenance on the weekend, this is what I found when I popped the Dizzy cap.
Is this a common problem with MSD?

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