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Again, like I said, too much room for speculation here and that's all it is - speculation.
Others may have had similar symptoms which were corrected by changing 'X', but that doesn't mean yours is the same problem. Though it may be (emphasis on may )
Lots of different things can manifest themselves as similar symptoms. For instance, as mentioned, it may well be the cats. What you describe is exactly how a failing cat might work - takes longer to warm up, until then, the DME selects all sorts of screwy maps resulting in poor drivability. Could be the secondary air system which prevents the cats from warming up properly, or timely - same effect.
My point is, get the car on a PIWIS or PST2 and find out what's really going on before throwing mucho dinero at a problem which may not cure your car's ills.
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