Hello ford forums, I have a 2004 ford explorer and recently the service engine light(SEL) came on. also, my idling is very rough, but drives normal at regular speed. I took it to auto zone to get a code reading. I got P0174 code, which means leans bank 2. I've replaced the intake gaskets, cleaned MAF sensor and replaced an 02 sensor, the problem still exists. Can anyone tell me where the vacuum hoses are located? I believe I have a vacuum leak, I here a hissing noise when I take off.