well is there a flight recorder the dealer can send you off with for a few days. At the Ford dealer I work at, we send out problem cars with flight recorder and have the customer come back when the problem happens. This will record all parameters of the PCM when the problem does happen. Never let anyone even a dealer just replace parts unless that is the most last outcome of their diagnosis. Trace back to what has been done. Tune up/Filters, etc.. Correct plugs? Filters etc.. Any loose connectors, grounds or damaged wiring? Let us know what happens and what the fix is

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6