My wifes 2002 honda accord auto has 40k miles. Today i was going about 35 mph, accelerated to switch lanes, and it hesitated as it downshifted. At first i thought it was tranny, until i played w. throttle. The engine was losing power, not the tranny slipping. I made it happen a few times to figure out what was going on. Cruising at low rpms and accelerating seemed to do it as it downshifted. As long as i kept my foot on the gas it would keep fluctuating. I accelerated from a stand still and the car did not hesitate.

when i got home, i pushed the throttle in park and at 5200 rpms, the engine would drop down to around 45-4700 rpms. I do not think that was the rev limiter kicking in.

It seems like it is not getting oxygen or fuel.

I don't know what it is. the 02 sensor.