You have an intermittant misfire. Once detected by the engine management system the system shuts down the injector on the offending cylinder, making it a continuous misfire. Recycling the key resets the issue until the misfire is detected again.

You should be setting a cylinder specific misfire code P0301 through P306 by cyclinder. I would probably change the coil to plug connections.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician