P0300 Chevrolet -

Question

everything has been checked and or replaced, ign. sys. and fuel, misfire can not be felt and no symptoms occur

Answer 1

P0300 Random misfire

The random misfire codes are the most difficult code. There has been sloution where the fuel pressure regulator leaking fuel into the intake from its vacuum connection, To the EGR being slightly open , to a partially plugged catalytic convertor, and leaking intake manifold gasket. There is one TSB that is always overlooked TSB # 06-06-04-046. this is where a ground strap can set this code condition