Have a CEL, plug in the obd2, have 7 codes. I can't win. Basically it's a cylinder one and three misfire, random misfire, and a PO420 cat converter code. I changed the spark plug, spark boot, injector on cylinder one.

I'm thinking fuel filter next and cat converter.

Any help would be appreciated.

P0420 Catalytic converter system, bank 1 - efficiency below threshold Possible causes;Catalytic converter, wiring, HO2S 2
3.7 Bank 1 Sensor 2 refers to the drivers side sensor behind the CAT
The fuel filter is built into the pump inside the tank.
You could also pull the EGR valve and clean it.

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07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

I'll start there and see what the results are. It does have 100k miles on it.