Haven't had codes read but no CEL has come on. I made a post about car running rough and using gas. It's still doing that some days better than others, but now anytime I get on the gas hard causing a trans kickdown, motor surges and lulls, surges and lulls, rhythmically. NO high-end power but all seems normal in city and even moderately-hard driving, just not when higher-RPM pwoer is called for. Tach does not jump/recede, doesn't seem to be a trans issue/slip. Definitely stumbling when power is needed. Also, motor bogs pretty noticeably now after a gear change if I step on the gas.

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL