2003 Audi A4 RUNNING POOR

Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position 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

Hopefully there is a check engine light on. If so, it will most likely be a certain cylinder misfire. For example, if u get a code which is a cyl 3 misfire, then u narrow it down to either a coilpack, or a plug. At 95,000 miles, id put plugs in it. Either NGK, or denso, either way, they have to be platinum for that car.