hey im new to this forum and i have heard good things. i have a 03 sport trac and the check engine light came on yesterday and whe ni checked with my code reader and it say that i am running too lean, so i checked my mass air flow, all 4 o2 censors. The strange thing was that both banks read too lean so i thought it was a vacum leak, but i cant find a leak even after i sprade carborator cleaner to see if i could see a leak. does anyone have any ideas.