Engine Performance problem
2001 Kia Rio 4 cyl Front Wheel Drive Automatic 122000 miles
My kia suddenly lost acceleration power. Then came good and did it again. I put my foot down on the accelerator and it helped a bit. The fuel pump has been replaced but I recently put 95 octane unleaded fuel > I usually use the 98 Would this be the cause ie bad petrol
Inspect and test all the following listed below: Oxygen sensor.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
Fuel pressure regulator leaking, fuel filter or defective fuel pump.
False air leakage.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.