Coolant on 1999 Jaguar XK8

The coolant is being forced out of the expansion tank and then runs very low to the point of overheating the engine. The plugs and coils have been replaced. The compression of all cylinders checks OK. The idle is rough. Where should we go next? This all started after the throttle body was replaced.

Asked by for the 1999 Jaguar XK8
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