I went to check it out..they said it was the fuel evaporation system...I have a leak somwehere and they said it could be many things...Could be the gas cap..I replaced it..Then they said it could be other things...But, what could it be

 

That's usually a sign that the gas cap is not on tight. With the OEM cap, I make it a habit of turning it for 5 clicks.

If it's an aftermarket cap it may not be sealing properly.

 

ahhh i need 5 clicks..i usually do like 2....Is that bad...Am i getting poor gas mileage