2010 hesitation/poot mpg.
This all started a month or so ago. I got a check engine light for the bank 2 knock sensor. The car has about 61k on it so i changed the sensor. Fuel economy was terrible I went from 16-17 to 12ish. I changed the oil and filter at this time too. Things improved slightly.
However, i still had alot of hesitation when trying to accelerate from a stop. I figured maybe the plugs need to me changed so i replaced them with acdelco plugs. I also changed the coils. Whe i was doing the coils i noticed the theards werw pretty oily on the bank 2 side. I replaced the vavle cover gasket due to a oil leak. The car drove better at rhis point.
The issues became intermittent with fuel economy going to about 14. Scaned the car again and i had a code (no light) for the bank 2 upstream o2 sensor (high voltage) i replaced the sensor and the car has better mpg but the hesitation issue is will there.
Where should i go next? Is there some live freeze frame data i should look at? Im at a loss.