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[BazaJT]

Tickover when up to temperature on my 3L is 500revs or just a tad below,however once in a while[there's no set pattern of time/distance/conditions]when slowing down to a stop at traffic lights/roundabouts the revs will drop further momentarily before recovering and sometimes it doesn't recover and stalls taking two or three attempts to get it to re-start which can make things a bit of a lottery when driving out and about.I'm thinking possible IACV problem or throttle body needing a clean? do these sound feasible?Any other ideas?

[Enceladus]

Sounds like a classic case of a failing crank position sensor. Read the fault codes and report back.

[Migv6 le Frog Fan]

I would also clean and lube the ICV. 

[biggriffin]

Clean icav, throttle bodies, and check that icav is airtight, if still doing this then new crank sensor.

[terry paget]

If all above fail, it could me the mass air flow sensor (MAF), easily checked by unplugging it (bringing on the EML) and seeing if the fault disappears.

[BazaJT]

I think I'll go with swapping IACV[I've got a new one in stock]and cleaning throttle bodies and see how it fares with that.