tps and egr won't have ne thing to do with a lean miss fire, make sure your not getting any secondary air ( air comming in after the mass air) after that check your 02
There is already talk of a boss probably will be 5.4 350 hp or around there
what would i like to see... will never happen but an all aluminum pushrod 400 ci n/a 6 speed live axle optional drag pack with diff gear selection