Having problems with my new '95 S420, 177,000 miles, unknown prior maintenance. Engine light came on, started running rough, rich and with practically no power car stopped. Get it home, check the distributor caps, worn with massive arcing, don't believe they had ever been changed. Replaced both caps and rotors, cars idles nice again, engine light still on, still running very rich, strong gasoline smell from the exhaust. I check the LED/button code reader get codes 4,5,6,7, and 25. Clear each code individually restart engine four times after letting it idle for a couple minutes in between each start. No codes recur, after three days, however still running rich, no power at all. Any ideas?

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jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000