HomeAll RepliesReply To: Code P0300 Multiple Misfires Reply To: Code P0300 Multiple Misfires Sponsored August 12, 2016 at 6:15 pm #136131 Alex LuftKeymaster @mkahealani need to know what is the year, model and engine of the vehicle you’re referring to. 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