I have a 1994 Mustang V6 3.8L and I noticed that I am getting a bit of a fume like smell coming through the vents when the car is idling. The odd thing is that the car must be moving for at least five minutes and then idle. If it idles from a cold start, there is no smell at all, even if I let it run for ten minutes. The smell is very minor.

When I pop open the hood, I can smell it a little bit around the cold air intake (which is all stock). I did change the engine air filter a few weeks...

1994 - fumes coming through the vents