1995 firebird 3.4 just backfires?????

ive got a 95 firebird with the 3.4 wont start just backfires checked coils and plugs and wires any ideas thanks?

your engine timing is off. I dont know if that means you need new belts/chains, running engine to rich, clogged fuel filters, bad fuel pump, or a combination of these or other things. but its pretty clear the stuff has to be readjusted. Id take it to a competent mechanic or a buddy who knows about that stuff.