2002 Kia Rio • 4 cylinder FWD Automatic • 80,000 miles

After running for over 45 minutes or an hour my 2002 Kia Rio acts as if it is running out of gas and I e3xperience a loss of power (50 or 55) being the top speed. Usually the car recovers fron these episodes and begins running normally again.
March 22, 2011.

Do you have a check engine light and when was last tune-up?

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 22, 2011.