P0300 Chevrolet -

Question

I have a 2002 chevy van 3500 with a po300 code seems to idle a little ruff but engine light flashes only on highway

Answer 1

Hi there,

This could be caused by a bad ignition coil. Usually it takes a certain set of conditions to make the coil have issues so sometimes this is why the engine won't misfire at idle or the light will only flash on the highway.