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[TheBoy]

You are right about running the a/c on a regular basis to keep seals from drying up etc. I wasn't suggesting that I wouldn't use it at all, just less frequently in the winter.

450rpm is way too low. The car shakes and shudders when you are stuck in traffic for more than a couple of seconds and feels like it is about to stall. It hasn't actually stalled, but I didn't like all the shaking. At 600rpm with a/c on, the engine feels 10x smoother; like a V6 should really.

if its uneven at 450rpm, then check the reason why - dirty icv, plugs, leads, failed cam cover gaskets etc

Don't mask the fault with a bodge

[Bourne]

As previously stated , ICV is new . Plugs ,leads etc all good. No leaks air or oil from gaskets anywhere.Eobd shows no stored fault codes. If there were I would correct it Not "bodge" it.

[TheBoy]

Look for air leak then.

450rpm is the correct rpm for V6 models, and is smooth.

[Kevin Wood]

Might be worth checking the cam timing as well, and if nothing found then, a compression test.

Kevin

[Bourne]

I did wonder about the cam timing as it had a belt change just before I got it. Is it possible to check it accurately without a cam timing kit though?

[TheBoy]

Is it possible to check it accurately without a cam timing kit though?

nope

[sophos9]

Sorry to drag up this old post but did you get it resolved?

I've got exactly the same thing going on...