Low rough idle running rich SOLVED
Rich Running Chevy 305
Rich Running LT1 when cold.
why my car is running rich after I degrease the engine?
O2 sensor reads the engine is running rich
what can I do About it
Probably got something wet that shouldn't be wet. Might just be the air filter got wet and you are not sucking enough air through it.
I'd check the tightness of the two or three O2 sensors as well. There's typically a crush washer on them
Imagine a heart as a car engine that is required to get emission tested.So, I went today,got tested.Seems my heart is running rich.
Running Rich issue cant solve.: Ok I have been driving the car with no issues for years. On stock tune with just... 
Swapped fuel pump relay after tune - Now running rich? Evo X Engine (4B11T)www.evoxforums.com/forums/showthread....