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 6 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.

2 people found this helpful.
Mark helpful
20

Joseph answered 4 years ago

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

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • 2003 Chevy Silverado 1500 LS 4WD 5.3L V8 P0300 Misfire Code 2 Answers

    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, clea...

    2003 Chevrolet Silverado 1500 LS Extended Cab 4WD

    -

    Maintenance & Repair

  • 2011 Silverado 1500 LTZ P0300 Misfire code 1 Answer

    Check engine light came on while passing a vehicle, Stabilitrak flashing, got it home, and it had a P0306 code, so Ive replaced plugs, wires , coil on #6 cylinder, all (8) injectors,throttle positio...

    2011 Chevrolet Silverado 1500 LTZ Crew Cab RWD

    -

    Maintenance & Repair

  • Stalling at Cold Idle - 2002 Chevy Silverado 1500 (5.3L - 4WD) 4 Answers

    I have a 2002 Chevy Silverado 1500 (Vortec 5.3L V8 - 4WD) with 215k miles that doesn't want to run when cold. On a cold start, it normally idles up to 1000 rpm and slowly drops down. Currently, it g...

    2002 Chevrolet Silverado 1500 LS Extended Cab 4WD

    -

    Maintenance & Repair

  • 2005 Chevy silverado 1500 5.3l v8 2wd engine light on after diy oil change 1 Answer

    Just did an oil change on my Chevy , put new filter and fresh oil 6 quarts . Then the check engine light came on . Everything seems tight fluids are good and running smooth . Any ideas as to why it...

    2005 Chevrolet Silverado 1500 LS Crew Cab RWD

    -

    Maintenance & Repair

  • P0301 Code for 2002 Chevy Silverado 1500 1 Answer

    A 2002 Chevy Silverado 1500 failed inspection due to code P0301. Apparently this has something to do with a misfire. The service engine soon light came on during the inspection. I've also seen this...

    2002 Chevrolet Silverado 1500

    -

    Maintenance & Repair

Shortcuts

Search Chevrolet Silverado 1500 Questions

CarGurus Experts

  • #1
    Rowefast
    Reputation
    10,530
  • #2
    Andrew Olsen
    Reputation
    9,740
  • #3
    John Carson
    Reputation
    9,720
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
122 Great Deals out of 5,187 listings starting at $3,475
Used Ford F-150
243 Great Deals out of 13,379 listings starting at $1,995
Used Chevrolet Silverado 2500HD
27 Great Deals out of 1,011 listings starting at $7,980
Used Toyota Tundra
23 Great Deals out of 823 listings starting at $8,995
Used Dodge RAM 1500
6 Great Deals out of 76 listings starting at $4,000
Used Toyota Tacoma
50 Great Deals out of 1,147 listings starting at $8,977
Used Chevrolet Tahoe
16 Great Deals out of 673 listings starting at $4,998
Used Chevrolet Colorado
30 Great Deals out of 1,438 listings starting at $5,850
Used GMC Sierra 2500HD
21 Great Deals out of 1,114 listings starting at $10,999
Used Ford F-250 Super Duty
21 Great Deals out of 1,272 listings starting at $4,999
Used Chevrolet Camaro
20 Great Deals out of 263 listings starting at $6,995
Used Chevrolet Corvette
18 Great Deals out of 1,074 listings starting at $14,888

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.