Well, I just got an Aurora that was surging badly, billowing white smoke and ran like ****. Turned out to be a bad fuel pressure regulator on it. It is vacuum operated on the Aurora and was sucking fuel through the bad diaphragm, through the vacuum line, and directly into the intake. It was also throwing misfire codes and soaking the plugs in fuel. I replaced the FPR and cleaned all the plugs and it runs like new again.
So, seeing as your symptoms sound exactly like what I was dealing with, my guess is for whatever reason, your car is drowning in WAY too much fuel. Now just figure out why. Pull the vacuum line off of the FPR and see if there is fuel in the vacuum line. If there is, there's your problem.
