Couldn't tell ya then man, sorry about that. Unless the car has a LOT of miles on it, theres almost no chance that you are slipping/burning the clutch in the automatic trans. Who knows, it could be anything that got sucked up and started burning, not just a bag. I would check it out. Look around the intake manifold, and follow the exhaust tract just to see if there is anything wedged around the pipe anywhere. Most likely if it is something being burned on the outside, it's on the exhaust.