I can understand that for clearing the CE light. I don't understand why it would run differently.

How did it run previously? How does it run now if you unplug the single connector?

Unless I am mistaken, it shouldn't affect anything anyway until the engine is warm/hot.

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles