autothefix

01 trans am, new a/c delco mass air,new cats,new plugs,wires, new fuel pump,no vaccum leaks,no codes.rebuildt trans with 2400 stall.at full or half throttle in first gear no problems until it up shifts in to second then its like someone just shut the fuel or spark off,has bogg/hesitationthen clears up and runs good.anyone seen this before???