G'day all got an au falcon dedicated (LPG) and it's got an inttamuntain backfiring, replace plugs, leads and coil pack it's made it better but still not great is their anything else I can look at like a relay or slow blow fuse? My old man brought the ute new and a week after having it took off from a set of traffic lights and it back fired but that was 150,000 km ago wonder if this could help. Also a mate said coz I'm running a k+n filter with it being oiled it's stuffing with my maf sensor by having a oil resadue on it could this be the possible cause? Any help will be appreciated as iv run out of ideas

Check for vacuum leaks.....manifold gasket, etc