I have a 1997 Honda Accord 2.2L non v-Tec, that is running rich and has a slight hesitation/stumble under more light throttle. When you put the throttle to the the floor the fuel trim seems to 0 out like it should and there is no hesitation. The engine has very high miles 340,000. I put a new head, head gasket, water pump, timing belt, balancer shaft belt and more, did a full tune up on it as well. The STFT seems to be around -14 to -27, the 02 sensors might be having issues cause they seem a little goofy watching the voltage swing specially the down stream sensor, but I just want to make sure something else isn’t making them act up. Any ideas on things to check would be great i can also post more test results from the scanner.

No after thinking about it I don’t think I did do a proper bleed on the system, the car is not over heating or running hot at all. Another guy had informed me that my negative fuel trim numbers are actually a lean number not rich. My STFT at idol is -11.0 to -14.0