my 1994 chevy caprice takes off slow then picks up speed

Hello, Hesitation on the 5.7L with throttle body injection (TBI) is most often caused by a vacuum leak, bad EGR valve, mass airflow sensor (MAF), or clogged air filter. First, the vehicle should be scanned with an OBD-I coe reader, and the codes should be diagnosed, then, if the problem persists (or there are no codes), the items listed above are likely culprits, and should be tested, not replaced.