If you haven't already done so, it might be a good time to do an oil change. The rich condition you just fixed didn't do much for the cleanliness of engine internals.
Hopefully emissions parts..ie...O2 sensor/catalytic converter are ok.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.