What does this seller mean?

Nickem

New member
1987 Audi 5000 CS Turbo Quattro: runs and starts but the car doesn't idle properly and sometimes turns off if the gas pedal isn't kept revving up.

I wanna know what's wrong with this car and how much it'll cost to fix.

The car is for sale for $1,100 it has 153,000 miles.

The seller says it's something with the fuel vent line?
 
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