Here is the info as I see it for ODB-II
P0302 Misfire detected - Cyls. 1-4.
P1170 Front Heated Oxygen Sensor Stuck.
First thing I would suggest is look for vacuum leaks.
s and/or bad spark plugs and/or spark plug wires. Again, I typically change the spark plug wires at 50-75k miles as a safeguard.
Then replace the front heated oxygen sensor if the above do not solve the problem. These age over time and should be replaced every 50-75k miles in my view.
Some preventative maintenance, in my opinion, goes a long way for the piece of mind that the car will not leave me or the family stranded.
JamesO