I had a problem with my 300 CE recently. There was no voltage (or intermittent) getting to the coil. Turned out to be bad wiring left over from an old alarm system. The supply wire for the coil is pink and red and is routed from the bulkhead into the fuse box(under the fuses) and then on to the coil.

Perhaps trace back to see if there is an interruption in the supply?
Best of luck.