Have a 2001 Explorer and a few months ago the check engine light came on. I replaced the fuel cap, disconnected the battery to clear the code and things seemed ok. After a couple months the it came back on. I brought it to Auto-Zone and the tested it and said I have leak in one of the vacuum hoses. Does anyone know where I can find out which hoses to check and the best way to figure out if its leaking. Thanks.