93 ford sho 5 speed hestitates on wot. did tune up, fuel filter, fuel injec cleaner?

I had the tune up done, fuel filter changed, fuel injector cleaner put in. K%26amp;N air filter is clean93 ford sho 5 speed hestitates on wot. did tune up, fuel filter, fuel injec cleaner? There could be a electronic problem . Try checking the timing . If thats ok-- check the computer readout with a diagnostic scanner. Email me if you need to. good luck..