Need Help With P0440.

#1
When I first got this car it had p0441 and p0446 so I replaced the Engine bay vsv the codes came back. I then replaced the whole canister and rear vsv that was on it. Now I have a p0440 code popping up but no 441 or 446. I am planing on replacing the gas cap doesn't look orginal and looks newer maybe just not sealing right? Edit: 1998 Le with 250k Miles.
 
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