2005 Chevrolet 1500 5.3 Throwing codes p0300 & p0455

Asked by Derrick Jan 08, 2018 at 02:44 PM about the 2005 Chevrolet Silverado 1500 Extended Cab 4WD

Question type: Maintenance & Repair

Hi I just recently bought a 2005 Chevrolet 1500 4x4
with 5.3L v8. Motor is running rough and had
diagnostics ran at autozone. Codes p0300 and
p0455 were pulled up and the computer suggests
an intake manifold gasket replacement. I was just
checking to see if that is accurate. Also TIGHTEN
GAS CAP shows on my odometer and the CHECK
ENGINE LIGHT FLASHES.

1 Answer
34,750

charles answered 6 years ago

300 is a random misfire the light will flash when missing. 455 is a evap leak yes tighten your cap to start. for a vacuum leak spray brake cleaner around intake gasket area while running and see if idle changes. ( up or down ),

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