No plats. Now, however, I see that they were H8DC. I looked them up and it says they are the "small style", and are listed for the following:

Spark Plug - H8DC (New Style - Small Size)
Parts # 002 159 58 03
Model: 190E 2.3-16 -- M102.983
Model: 190E 2.3 -- M102.961
Model: 190E 2.3 -- M102.985

Mine, obviously, is an M103, and it shows that I should have H9DC.

I don't know what would make 1 work and not the other. However, is this enough to cause my problems?

Also -- what are "resistors"?

It did this from day 1 after the repair.

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

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43k miles