HomeAll RepliesReply To: Code P0300 Multiple Misfires Reply To: Code P0300 Multiple Misfires Sponsored May 31, 2016 at 6:35 am #129533 Hav6pt2Participant Might be a bad spark plug in cylinder 3 Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored