01 Mustang GT s slow

Help!! I just bought my son a 01 Mustang GT. It s a 4.6 with a 5 speed. The car sounds healthy but when accelerating in first and second gear the motor revs and sounds like we should be hauling the mail but it isn't. In third gear at around 4500 rpm the car seems like it wants to come alive. Any ideas? Thank you.
 
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My initial guess is the clutch is slipping and bad. If you can take off and see normal use at a slow speed, light throttle and then floor the throttle and watch the tachometer go bonkers high and then speed catch up, it's most likely the clutch bad and/or poor adjustment. However, I'd suspect bad clutch. How many miles? Did the previous owner tell you anything? Did you test drive before $$$$? Of course, this is all provided the engine is in tip top working condition. btw, how many miles?