Hey today all of a sudden my G started sputtering in idle and has a rough driving experience.
Here arew the codes:

P0300
Random/Multiple
Cylinder Misfire

P0139
02 Sensor
CKT Slow Response

P1147
Manfacture Control
Fuel Air Meter

Just Changed the belts about 2wks ago, oil is still good, radiator fulid is good fuel is holding at a constant pressure.
I do apperciate te help.