C30 Engine : Erratic idle when coming to a standstill

[rules]

Good day all

I recently bought a little C30 2.0 and I must say I love it. Have been wanting one for years (well probably more the T5, but hey, can't have everything).

I just want to double check something though, when slowing down at an intersection or the like, when engaging the clutch and coasting the last bit before coming to a complete standstill, the revs seem to fluctuate quite a bit. I'd guess between 400 to 1000RPM. Once stationary it settles down and idles normally. Once when doing some "spirited" driving I had to slow down a bit quicker than normal and the car actually stalled.

Would this be considered normal or am I maybe doing something to cause this?

Thanks,
R