GM-GMC: 92 454 ss bakfire, mass air flow sensor, mass air flow

Question
i have a 92 454 ss that back fires thru tbi and sputters apon hard acceleration.only does this when engine warm.no ses light or codes.changed plugs,wires,ignition module,rotor cap and button,cam lifters,pushrods,fuel filter added msd ignition box and msd coil.thanks for any help.

Answer
well theres several things that could be wrong with it. a bad intake air temp sensor bad mass air flow sensor or if the timing isnt set right with the modified cam then you are going to run into trouble as well. also the programing for fuel delivery, if you are runing a bunch of upgraded parts the computer isnt programed to deliver that much fuel wich in turn can cause pre-detenation of the fuel so the pcm may need to be reprogramed for the mods you have done.