Car loses power and backfires when you hit the gas

Start with checking for codes , then check MAF for leaks, defects or contamination . Verifie proper fuel pressure while making it back fire and under load , also check for vacuum leaks . A backfire through the intake is a sign of a lean condition ( low fuel pressure or too much unmettered air ) so I would start checking these things frist , Of course a timing concern can cause it but not likely that it would run ok after the breif pop or hesitation.
john

Fuel Pump Pressure or Timing, IMO