[TimInNOVA]

You really need to baseline this car or you will spend endless hours chasing down issues. At that mileage and with those codes I would recommend changing the following:

_The Fuel Filter
_Both MAF sensors
_Both Exhaust Cam Position Sensors*
_Both Pre-Cat O2 Sensors

Consider this a good starting point. Best of Luck.

*I was also getting a b2 (bad cat) until I changed these.

 

[TimInNOVA]

Misfires could also be coils, but try the plugs first.

 

[TimInNOVA]

Eee-Gads those plugs are fouled up. I imagine your pistons and your valves look similiar. Consider running a bottle of Chevron Techron in your tank for the next few fill ups. Can't hurt.