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2002 2500hd 8.1l high rpm backfire



Truck has been idling rough and had typical issues with crank positioning sensor(intermittent dieing while driving)...Did Complete Tune up (iridium plugs .045 gap, fuel filter, MSD wires, air cleaner, CPS and relear) did not do O2 sensors... Truck Btw has 197000 miles on it still runs like scalded dog..But now truck backfires on hard pull right at shift point?... Any thoughts...Intake gasket?....fuel pressure checked at idle and is 58 lbs(yes is adjustable and has been turned up since 100000 mile)...havent checked fuel pressure at backfire

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