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.
1994 C280, dark green metallic
1991 190E 2.6, Black
(sold to another forum member)
2003 Chevy Tahoe LT, Redfire Metallic
1989 Mustang GT Cobra Convertible