2001 Monte Carlo SS is idling real rough and as no acceleration power, multiple codes found

Question

P0404 P1404 P0135 P0137 P0300 P0336 any way to narrow it down? I think it is either Catalytic Converter or EAR Valve... I have a code reader that tells more info thanks

Answer 1

P0404 Exhaust gas recirculation range / performance

P1404 Exhaust gas recirculation range performance (position open)

P0135 H02S heater circuit malfunction bank 1 sensor 1

P0137 H02S heater circuit low bank 1 sensor 2

P0300 Random misfire

P0336 Crank shaft position circuit "A" circuit range / performance

You  surely have a EGR that is open it will creat a random misfire and give the 02 sensor performance problem , and your idling problem, You can either remove the EGR and inspect to see if the pintle is open and clear out any carbon