i greatly appreciate everyones reply. i guess i was a little vague. the car is hesitating as i am accelerating, it is doing it all rpm speeds. in response to what plugs they are motorsport platinum. i haven't had this car even a week and i can't believe this is happening, it only has 51,000 miles and it is very clean. i am a ford mustang junkie and this car is driving me nuts. i have had 5.0's in the past and loved them ! i just hope my luck gets better with my first 4.6 mustang[:@]

 

it sounds like its your plugs or mabye even a dirty fuel system.

 

Some dying fuel pumps can pump out enough fuel to idle like a normal operating car, but choke bad under load...