FYI, my 97 required new resistor tips/caps when the plugs were done last February, at 80k, due to the same symptoms you described.
My AMM went south this fall at 105k, and that was the flat acceleration at 4500rpm.
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former: 83 300D, 97 C230, 93 400E
current: 08 C300 Luxury , 92 500SL
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