2002 Hyundai Elantra P0441 code

I got a p0441 code incorrect purge flow and I changed the gas gas vapor canister vent valve, I m guessing that the vapor canister itself, I tested the purge valve in the front and it's still getting current. But after driving it for a while the damn thing still pops up, I was wondering if anybody knew what else could be causeing that code.

ps- I put a resistor on the IAT sensor soo it shoots extra fuel, and theres a hissing noise coming from the gas tank.

thanks,
Johnyboy1223455