1991 Chevy Camaro Car jerks and slows down when going up in

Do have a check engine light coming on and when was the last tune-up?

Lack of acceleration,chugging,hesitating,bogging,misfiring etc. could be caused by one of the following below:

Start here-inspect and test all the items 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.
False air leakage.
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.