my blazer still hesitates all though not as bad but still seems like its starving for something, it starts and idles great but still has a little hesitation with a load on, ive changer, tps, cat, fuel filter, plugs, and finally the fuel pump. any help would be great.

 

Have you changed the plug wires also? How about cleaning the MAF? Also take a look at all the vacuum hoses to make sure none have come off or been left off.