[s-cars] Rough running - need advice what to try next?

[James Murray]

List advice needed....

Patient: 93 UrS4

Symptoms: Once warmed up, car runs rough, loss of power (hesistation and
slight bucking on acceleration), as if running with one less cylinder or
not getting fuel...no check engine light illuminated (but have not
pulled codes yet). Car seems fine when first cold, starting up. 

Procedures attempted: Swapped out coil pack, Spark Plugs, and WGFV (no
appreciable difference). Have tried pulling injector connectors on each
cylinder, just makes it worse at idle.

Next on the list of potential items to check:

1. Oxygen Sensor
2. Knock Sensors
3. POS Device
4. Fuel pump
5. Injectors
6. MAF

My number 1 candidate right now is the Oxygen Sensor... what is the list
advice? 

Cheers, /Jamu.