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[dbug]

Ac on will open the Icv more to increase the tick over to account for the extra load of the ac pump.

The Dbw cars hold a constant 600rpm regardless of ac on so don't compare the performance of the two IMO.

But, ime, you have typical icv issue. Clean and light oil. Might need several cleans to take effect. (Dont be tempted to open the valve with a screw driver or metal object like I did, as it will easily chip and then stick.      )

2.5 V6 isn't dbw - so tickover with a/c off should be 500rpm, 600rpm with a/c on

[TheBoy]

Does sound like ICV, so thats first port of call.

2.5/3.0 tickover should be 450 (AC off) or 550 (AC on), and rock steady.
2.6/3.2 tickover should be 600 irrespective of AC setting, and tends to be slightly lumpy.

Given the failure modes of MAFs on 2.5/3.0, I'd not immediately be suspecting that, but if you do want to unplug it, ensure you read the codes beforehand, as the MAF will store another if you unplug.

[Webby the Bear]

thanks for all the infi guys. going to crack on with a few things you mention today - drove it already today and it hasn't acted up yet 

[omega3000]

Sounded sweet when i was in it ... Italian tune up required 

[martin42]

Stop driving it like a granny and dire it like you just stole it 

[Webby the Bear]

you may have hit the nail on the head there. I do drive very sloooow

[chrisgixer]

Ac on will open the Icv more to increase the tick over to account for the extra load of the ac pump.

The Dbw cars hold a constant 600rpm regardless of ac on so don't compare the performance of the two IMO.

But, ime, you have typical icv issue. Clean and light oil. Might need several cleans to take effect. (Dont be tempted to open the valve with a screw driver or metal object like I did, as it will easily chip and then stick.      )

2.5 V6 isn't dbw - so tickover with a/c off should be 500rpm, 600rpm with a/c on

I know, it was being compared to a 3.2 earlier. Very different. As you and i are saying.