Peper went into limp home mode, and as my wife said, " All at once, the car started running like crap, and the dash lit-up like an acre of Christmas trees." I checked the OBD and got tyhe following codes:

P0300 Random/Multiple Cylinder Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0420 Catalyst System Efficiency Below Threshold (Bank 1)


What is going on? How do I get Pepper back onhis wheels?

Thank you
Motor on, from the old man.

 

Pre-cat O2 sensor, plug or plug wire.....?