i got my car inspected today, and passed but thats not a concern. what happens with my car is that if you stall it once, no more luck. When you try to turn it on, it will, but then die instantly. if you give it a little gas, and hold it at 1500 or so for a few seconds, it goes back to normal idle, and doesnt shut off. so the mechanic at the shop didnt know this, stalled it, and just kept dying on him when he tried to restart. when he finally got it, and did the sniffer test, there was BLACK smoke coming from my tailpipes. I have never seen exhaust smoke so black except for those old diesel truck engines. i got the car about a month ago, and it didnt have problems until i did the plug wires. turned out i had 1 going to the wrong cylinder, so thats fixed. also, the spark plugs could be changed. I pulled #5 and it had a tanish powder over it. Lastly, when my car is parked, maybe 10 min after i drove it, it smells like gas around the rear. i have checked the ground, lines, filter, tank and there are no leaks, why the smell? so overall, any ideas what could be causing my richness from the described symptoms?