P0300 Chevrolet -

Question

I have a 2003 trailblazer and the light service engine soon come on with the code p0300 I replace all the spark plug and the coils to.but I still have the same problem what do I check now ? Please help me.

Answer 1

HI there,

I would check ignition timing and also check for any intake manifold vacuum leaks. low fuel pressure can also cause this type of issue as well.