I had noticed my car not responding as well recently. When coasting at around 40pmh, if I openned the throttle wide, the car would hesitate to speed up. Also my car was running very sluggishly, vibrating in a word. What I had previously believed to be a fuel filter related problem, turned out to be my spark plugs that I had replaced when I bought the car with NGK TR5GPs. This was last July (2004) I have driven about 30K since. Well I figured I might as well check out the plugs, turns out that plugs 3 and 6 and a lot of gunk and seemed oily. While the others had little or no gunk and werent oily. They were dry and had a greyish residue over them.

Well I replaced the plugs with Bosch platniums. And the car responds a lot LOT better to sudden acceleration.

I am just curious why only the plugs from cylinder 3 and 6 were dirty and not the rest?

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM