ZS keeps driving its self please help.

Hi all i have a 2.5 v6 ZS.



to start, the car keeps reving when its idling sometimes jumping between 900rvs to around 1500-2000rvs it dose stop when lifting your foot under the peddle.

The problem continues when driving not to bad when going up hill but when coming down its a bugger lol even when changing gear the car jumps to around 5000-6000rvs starting to cost a bit on fuel needing some advice badly. we have put a new throttle body on with new (icv) problems still there if anyone knows what to do and i have missed please let me know thanks in advance.

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