Originally Posted by JeepAndAVan

Remove the air cleaner box under the hood (big black box on the passender side under the hood). look for two plastic tubes runningunder it from front to back. one of them makes a 90 degree transistion to a tube coming up from below back by the firewall. Check the piece of rubber hose that connects these two tubes. mine was dryrotted and cracked so I replaced it and all was well (5/16" vacuum hose available at an auto parts store. Get enough to make a loop when you replace it instead of just a 90 degree bend. This will keep it from cracking in the future). The other places to check would be the gasket on the gas cap and the filler neck assembly as it can rust out and set these codes. you may have to trace and check all the vaccum lines that are a part of the fuel evaporative system...