Few rough idle questions

[A4B6Cab]

As some of you will know have had a few problems with my 3.0 V6 (petrol) recently. Had a camshaft position sensor replaced, and the ECS light has not come back on, but the car still idles quite rough, heres a few notes and wondering if anyone has any ideas?

First start up from cold, idles at 1100rpm
After a 5 mile drive, idles at 900rpm and every 10 or 15 seconds drops to 800rpm for a second or 2. Never stalls

Gave her a bit of a thrashing earlier for half hour (only up to 4500 rpm) and then she idles at 800rpm with no coughs or splutters

Any ideas where to look next? She's serviced yearly and only does 4k a year, so am planning a service in the next week or 2, just wondered if the above issues were common, or if any of you had seen then before?

Thanks in advance

[fanta]

Oil pickup clogged perhaps.

Could also be pcv valve/s

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[niall campbell]

looks as if the thrashing helped

could be egr valve sticking, I would just monitor