Is it said 'a FAQ' or 'an FAQ'?

Answer 1

Depending on pronunciation, both statements are correct. To clarify, if you pronounce "FAQ" as "fack", as in trying to make the letters into an actual word, you could say "So, I read aFAQ the other day, it was helpful." If, however, you pronounced it as three separate letters (like an acronym), F.A.Q., then you could use "an FAQ", used it in the phrase "I don't know the answer, why not check an FAQ?"

1. See the rule of English if Front consonant letter sound; than A, but if Vocal sound than An-Definitive and Indifinitve article answers yours the best of your question above.