So my car will randomly act flooded and will crank, fire, sputter, and than die. To start it I must hold the gas to the floor and crank it till it starts than feather the throttle for a second to keep it running. When it starts I get a huge puff of smoke out the back (unburned fuel) but within a few seconds it idles down fine and acts normal. This doesn't happen on every start up and doesn't happen when the car is warm. Could this be in the tune or possibly an injector leaking down?