so i got the car from the guy in the den drove down to reno to begin my boxing carere now i cant find it i know about the quest where they steal it but i cant talk to anyone about it i tried leaving and it didnt appear after stoping in the wastes

Go into the parking lot. There you will find tire tracks.

You're car is stolen eh lol Go to where you parked it. You should notice Tire tracks.

Ah yes, this was one of the funniest places for dialog....the chop shop. I liked how you could do a Vader routine on the leader guy. "You think your being treated unfairly?" Also if your a girl you can six him to death.

does it park to the left where the enterance is in the parking lot and theres nothing there but 3 destroyed cars

This is where the car parks, http://www.project610.com/files/virgin%20street.png. Its on Virgin Street. Go there and you should notice tire tracks then follow them.

If some how that does not work you might need to ask around, Jules and the cats paw.

No tire tracks Jules dosent have any dialog about it

http://fallout.wikia.com/wiki/Recover_your_stolen_car

that might help, I never had it not spot the tire tracks. Did you walk down and into the parking lo?