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Here is one that says Stihl on its case. http://www.sawagain.com/stihl-ms-270-280-coil-11334001350-new-oem/ I read that they built variable timing into the coil on that model for easier starting. Seem to wear out after a few years.

Kind of strange a brand new coil would be bad.

The wire going to the kill switch or the switch itself could be at fault.