I smell gas coming thru my air vents inside of my car. I have a 1998 Chevy Malibu and I just got the intake fixed on it.

Open the hood, start the engine & check for obvious fuel leaks ( fuelrail, pressure regulator,etc. ).
If you did not have the smell before the repairs, you SHOULD take it back to whoever performed the intake work.

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2007 C 230 Sport.

Did you just eat Mexican before you drove the car?

Len

Take it back to the repair shop ASAP!