97 suburban is now a 2016 suburban motor wise only parts left to replace distributor and sensors

ergo the problem i guess i am having

absolutely no response but a horrible hit mid crank first couple hrs of tinkering then a rough start rough idle then smoke backfire and back to original problem

seems to be worse in am and culminating into pm as symptoms subside and truck wants to run .
no security new Delphi pump new filter new plugs wires like i said only sensors have not been replaced cause when i rebuilt top end and fire it up it was purring actually loaded my Nissan frontier on car carrier and drove it down to florida from west Virginia the day after i pulled it out of the garage.

yesterday went from running great to not running at all til at dusk then it runs rough been moist down here.

any suggestions. ps fuel system new all of it and a complete engine gasket kit has been applied i mean i didnt leave nothing to chance but the sensors