Revs up

Been tinkering around on the motor this afternoon trying to sort this one out.
Range Rover 3.9 when I start her up the revs fluctuate then settle. a few times in really cold weather she has stalled after stopping when cold.
Revs are staying a bit high on tickover 750ish instead of 550ish.
Checked for air leaks, sticking throttle, cleaned air sensor. Any suggestions.
Usually feels like new just at moment feels a bit sluggish.

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