When I start the engine up first thing in the morning the rev needle reads 1000rpm and sounds like it is struggling at idle, then after about 3 minutes of warming up it drops down to 900, is this normal?? The needle doesn't flicker it remains on either 10 or 9

 

Thanks

That's normal I think. As the temp rises the revs reduce to normal tickover.

I agree, it's normal.

I've noticed raised rpm in 3 cases:

1) cold outside when you start the car;

2) it's hot outside and you turn on the AC;

3) DPF regeneration. It's unlikely to start when the engine is cold. And anyway 900 rpm sounds more likely to petrol rather than diesel.