But it only dos it when i shut it off when its warm. Now i thought it was a head gasket leaking water into one of the cylinders because it gos away after i start driving it and it feel like i have 1 or 2 dead cylinders.But i have no water in the oil or bubbles in the coolant and all my pluges look the same, but iv ran the sodium stuff just in case and it did help the only thing we think it could be is injector problem or my coil pack, what do u think