CEL Code P0455
 

Howdy guys. My 2000 Boxster is now pulling this code. I found a loose plastic line under the drivers side near the rear tire and put it back together. Still pulling the code. Thought it might be the gas cap (changed it out no change). Car typically runs well unless you just filled the gas tank. Then it can take 5-10 seconds to start.

Any suggestions on where to start looking?