On our 200 ML320 with 65k miles, I got a simultaneous rough idle and check engine light. Code says 0302, misfire on #2. ( I actually looked, and the cylinders are marked 1 through 6. What a concept)

I installed new plugs, Bosch Platinum 2's, checked resistance on plug wires at 2k ohms. I then cleared codes and on restart the CEL came on, and the same codes popped right up again. I pulled off the coils for #2 and #3 and swapped them. Cleared codes, and same results.

I am looking for suggestions as to the next steps, or in their absence, a referral to a good independant shop in the Hayward/Oakland California area.