Catalytic Convertor Problems of Jaguar S-type

Took my 2000 jag s type to dealer on 2 Dec 2005 for recall of engine breather elbow. The engine breather vent tube was replaced. At the same time, I told the dealer that my engine light was on -- they checked it and stated that I needed a fuel intake sensor. On 9 Dec the sensor was replaced. Within a week, the engine light came back on, was advised that the part was probably bad, they ordered a new part and it was installed. Left the lot and the engine light returned. I returned to the lot the next day and they supposedly cleaned all the wires and applied stab lint to the harness. Left lot and the engine light returned. Was then told that it was no longer the fuel temperature, it was a wiring problem and they would need at least 3-hours to trace the wiring that the problem was somewhere between the processor and the sensor. Must remove intake and hardware to access. Not very comfortable with the explanation so I took the car to another import dealer and he stated that it had 2-misfires and the catalytic converter needed replacing and something about odu. I was asked if my car had gone through emission testing and in Feb/Mar 06, my car passed emission testing without any problems. Also the dealer found a Ford new clamp (I have pictures and the clamp) in my vehicle sitting above one of the pistons causing a gap. He thought that this might have been what was causing the problem. Well, it seems that my car is being constantly diagnosed on my $$$. If the problem is not there, I get a bill, pay for it. Lo and behold, the problem still exists and now it is for another reason. Seems like the dealers are trouble shooting on my dime. My car is sick -- it is like it is struggling to get its next breath or that something is blocking the air flow. It sputters at a point. I've only used the highest premium gas in the vehicle. I've been advised to not use this gas and then later advised to use this gas. I'm so frustrated at this point.

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