I have an 86' IROC, I can get it to start but it will only run for about 30 seconds. I can do this several time and then it floods. It smells so rich. I have replaced the fuel pump because it was bad. At first i thought it was the MAF so I took it completely off and ran it wide oen but no change. I am not sure what it cound be. I cannot find any vacume leaks or anything. Something is flooding it. What could it be? Any help would be useful.