I think there was another user on this board with a 4.4 that idled the car for about 45 minutes and then it drove sluggish. I forgot what his outcome was.

Possible catalytic converter? Restricting the flow and therefore reducing the power?

Can anybody pull that thread back up? It might help.

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X5 E53 3.0 built 6/20/04 w/ 19" Sport Pkg Wheels.