Runnin rich

Does anyone out there know why my 96 jetta smells so gasy. I replaced the spark plugs and wires, oil, and even added treatments. But nothing has helped. I have also noticed the car tries to die out now as well. Only when my ac is on and only if i'm at an idle. HELP ME!!!

oh by the way. It's a 5 speed, with regular up keep. And also now that it's been such a high fuel mix there is white smoke out of the exhaust and brown exhaust stains on the bumper. THANK YOU!

Has your coolant level remained constant? White smoke is often steam (coolant). If it's running rich, it should trigger errors on your OBD-II, such as fuel mixture rich, O2 analyzer errors...
Todays cars seldom run rich without triggering errors of some sort. Check your spark plugs for carbon buildup or deposits.