I have a 94 Cadillac SLS with 157,000 = was running good up until about 3 months ago. Cam Sensor went bad and replaced that sensor along with the ignition module which also tested as being bad. This was replaced then and everything was fine --then about three weeks ago all heck broke loose
I started to loose gas mileage, and stepping on the accelerator after the engine was warm was like stepping on a grape -- dead petal and then all of a sudden instance acceleration along with a down shift - had to pick my head up out of the backseat!! During cold running everything is fine.
When I recentely (two weeks ago) replaced the fuel pump I found out the owner before me bought cheap gas and the tank had a lot of junk in it -- at that time I also replaced the fuel filter - and all the injectors, the MAP sensor and the fuel pressure regulator. Much improvement - but still the dead petal and rough idling when the engine is warm.
Out of no where this morning on the way to work a P043 code was registered (I believe that is the oxygen sensor). When the service engine light came on - the car settled down and actually drove normal until it reset itself and back to the roughness.
My mechanic told me that I have been running so rich for so long that the car just needs to get a good running for a week or so to allow it to settle down and then we will begin the next phase. Does this sound logical? I hate being a "let's replace this and that person" - but the car is so good - and right now I am so unhappy -- I just want my SLS back to the wonderful car it has always been.
Does anyone have any test procedure an information for a P043 service code?
Does anyone have any suggestions what I have overlooked to smooth this car down?
By the way the plugs and wires were replaced just about 50,000 miles ago.
P043 -- headache -- what is happening??? 
