I really think you should have a look at your cap and rotor. In my experience with the m103 engine, oe wires last 5 years, oe cap and rotor about 3-4. Plugs regardless every year. Bosch stuff lasts half as long, and the rest fail almost immediately. (Months later).

I had a m103 that had something jacked up with the ignition coil and kept burning up my cap and rotor. Symptoms exactly like what you are having. New (used) coil and the problem is gone.

These engines are just fancy carburetor engines. Don’t overthink it. Let it warm up and when it stalls, and won’t restart, spray some gas in the intake. That will let you know in 2 seconds whether you have a fuel or spark problem

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2