Question

I have a 1997 Chevrolet E350 with engine code P0300, how do I fix this problem?

Answer 1

P0300 Random misfire

Check the ignition system , what the random misfire is is more than 2 cyclinder are misfiring this can be from faulty ignition wire to faulty cap and rotor, to a mechancial condition or even a vacuum leak

Answer 2

P0300 Chevrolet Code - Engine Misfire Detected
Read more: https://www.autocodes.com/p0300_chevrolet.html