1993 Pontiac Firebird • 2WD Automatic • 140,000,000 miles

My 1993 firebird wont accel over 35 to 40 mph what could it be because of.I bought it off a friend they last said it would just boggg down at like 40 after it has ben warmed up. A mechanic said that it was the caltilac converter. It is supposly plugged. Is that even close?
February 11, 2011.

Do you have a check engine light on?

Lack of acceleration, chugging, hesitating********, bogging, misfiring etc. Could be caused by one of the following below: Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard it and keep testing.

Mar 18, 2011.