Posting on my Uncle's behalf.



It's a 2005 Chevrolet Silverado 1500 2WD 4.3L Fl OHV 6cyl and is having ignition issues. We'd like a good starting point on how to fix and check things off.



CODES:

P0016: CRANKSHAFT POSITION CAMSHAFT POSITION CORRELATION BANK 1 SENSOR A

P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1

P0446: EVAPORATIVE EMISSION SYSTEM VENT CONTROL CIRCUIT

P0016: CRANKSHAFT POSITION CAMSHAFT POSITION CORRELATION BANK 1 SENSOR A (I NOTICED IT CAME UP TWICE ON THE SCANNER)

P0102: MASS OR VOLUME AIR FLOW A CIRCUIT LOW

P0122: THROTTLE / PEDAL POSITION SENSOR / SWITCH A CIRCUIT LOW

P0300: RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED

P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1 (CAME UP TWICE ON SCANNER)

P0446: EVAPORATIVE EMISSION SYSTEM VENT CONTROL CIRCUIT (CAME UP TWICE ON SCANNER)

P0506: IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED



Any help to get it running is greatly appreciated. Thank you.