2003 Chevy Silverado 1500 LS 4WD 5.3L V8 P0300 Misfire Code

Asked by Josh Nov 01, 2018 at 09:39 AM about the 2003 Chevrolet Silverado 1500 LS Extended Cab 4WD

Question type: Maintenance & Repair

I have a check engine light on for over two years. It has been two P0300 misfire codes. In the past 2 years I have changed out all 8 plugs and wires, fuel pump, fuel filter, mass air flow sensor, cleaned my K&N air filter 3 times and fuel pressure regulator. I am not sure what else could be causing the issue? Vacuum leak? Try the changing plugs again (1 1/2 years old)? My gas mileage has plummeted and when idling it drops to below 500 rpm.

2 Answers
20

Jim answered 5 years ago

Was told K&N oil messes with map sensor and recommended I go back to stock air filter on my 2016 Tahoe. Got the 0300 code tonight so off to dealer for diagnostics and repair. Try there first if not already fixed.

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20

Joseph answered 4 years ago

Unhook pvc at intake and plug it I changed everything myself that was my issue

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