Hey guys I just picked up a 98 Grand Prix 3800. I changed the plus and wires, new fuel pump and sender, cleaned maf, new Tps. The engine normally runs great but about one out of ten times when I push the gas from a stop it has no power and doesn't want to go, if I completely let off the gas and hit it again it goes fine. It's definitely in the engine it's not the trains slipping or anything. It seems to bog and miss, any ideas where to look next? There are no check engine codes.