Not much.

I did think it was idling better shortly afterwards
But back to normal now.

I have added a can of BG44 to full tank of fuel, so far I have 1/4 of a tank left no change as of yet
also I have ordered 8 new spark plugs finger crossed  2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

Just received 8 new NGK spark plugs so I'm going to fit them on Sunday. I have checked the gap and its set to 0.8
should I change them to 1.0mm ? 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

Yes

Hi all spark plugs re-gaped to 1.0mm and installed, It starts fine, drives fine, pulls fine and ticks over fine BUT
when I give it a rev in neutral rather than coming back down to tick over 650rpm ish it drops all the way to 500rpm then it hunts up to 650 and then down to 500 again it dose this 3 time before it sorts it shelf out
can anyone please help me.
I have check all plugs, coil packs are seated, coil plugs are clipped in all the way?  2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

Update it only hunts when its cold/warm when its up to temp its fine. 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

I don't think jaguar did a very good job of the engine management

update now my engine management light has come on so I have plugged in my Isoft LR2
and I have bank 1 running lean??? all I have done is change the spark plugs?
 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

I have run the engine up so its warm and then unplugged my MAF and now I can give it a rev and its straight back down to 650rpm tick over perfectly
I will order a new MAF and see how that go's... 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

Mine don't like the really hot weather (like last week). It runs rich according to the code

MAF changed and it still hunts  2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

update I have taken all the plugs out and double checked the gaps they where all correct
so after re fitting them I started it up and bingo! now it ticks over even after a good rev.  2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE