2001 Jetta 2.0 engine automatic

Please help me, i had been having lots of problem with my car and spending lots of money. My car just came out of the mechanic shop and I keep smelling gas, when I am driving it I have to open the window, it is not leaking the gas, the mechanic just put in a new sensor, peak flow meter and filter.

Kindly help me and advise

Is the smell like raw gas or burnt gas (as in exhaust)?