Yesterday I went drifting around my neighbourhood but then all of a sudden my engine light came on and my engine started running weird it doesn't seem like anything major like no knocking or odd noises. All that is happening is that if i drive it slowly and gradually bring the rpms higher the blow off valve starts pulsing and actuating and if i'm at a complete stop and hold throttle at about 2k rpm and hold it, it starts missing and cutting out. what could it be? haven't tested the codes to see what comes up yet.