After you try the injector move that Steve sensibly suggested, if that doesn't work, check the connection to the COP on #5. MSD's can be a tighter fit than the OEM COP's and not properly pushed home. Examine the COP for dampness (on and in the tube part), and ensure that the contact spring is properly seating on the spark plug terminal. Finally swap #5 COP and another in the same way as you did the injector. Peer down the plug hole and see if the plug insulator ceramic looks discolored or "different" to the others.
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