UPDATE....I installed the 4 new Beru ignition coils I received from Pelican Parts, along with 4 new NGK spark plugs. No more miss, and no more P0303 and P0304 codes.
Engine idles extremely smooth and runs great.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible