Okay so i'm getting some trouble codes and i have the haynes manual so i know what they are but i don't know what they mean. I got a code 94 which says "secondary air system inoperative". I don't know what it is refering to. I think i also threw a code 66 "No mass air flow sensor signal". I really don't think i have a maf. I think the previous owner took it out because i don't see anything in there like the pics i've seen of the maf for an 88. Obviously i'm having some sort of air problem. My stang will die every once in a while and it has the symptoms of vapor lock. I'm wondering if an air problem could also produce symptoms of vapor lock. I'm pretty sure it's not a fuel problem i've ran a few tests and replaced a few things. Can anyone help me. I'm really baffled on the code 94 that's my main concern. Thanks.