Does anybody know what would cause real bad gasious fumes inside the cockpit of a 240z? I have a '71 that is giving me this problem, and my '73 was doing it also. I've been told it might be the gaskets for the taillights. Could carbs running too rich cause this to happen? Is this happening to other 240z owners? It is dangerous to drive a car like this, and would like to rectify the problem. Thank You.