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[TheBoy]

Like Kevin Wood, I was thinking along the lines of over fuelling at idle. As soon as dumped in D, the fuelling is better.

[Andy H]

Like Kevin Wood, I was thinking along the lines of over fuelling at idle. As soon as dumped in D, the fuelling is better.

Why the fast idle though

[TheBoy]

If it can see its overly rich at idle, it may try to let some air in...

[Gaffers]

Spent some time today diagnosing the misfire on kitty (XJR6 X300'97 - last of the real jag straight 6's) and amittedly the lack of spare time means that it has been a while since I last looked at it.  Because of this i started from scratch with the diagnostics.

In Park - misfire is present through out the rev range and the engine is lumpy on idle despite high revs
In Drive - misfire is all but gone, revs drop to normal

Regardless of gear the engine responds perfectly to the accelerator, can take a while to come back down.

At idle:
Pulling plug leads one by one I saw that cyl 2 was the one misfiring.
swapped dis pack with anoth cylinder = no change
swapped plugs = no change
removed ECU and traced wiring back = no wiring issue
removed MAF plug = no change in revs

The last work done was changing the ICV Stepper motor but I havet driven her since.

So, my thoughts are now either air leak, faulty MAF or Ineed new injectors 

Those two symptoms shout air leak but I don't understand why the ECU doesn't control the idle speed correctly (unless it is a very big air leak)

Where does the brake servo vac pipe connect to the inlet manifold? is it straight into cylinder 2?

Is this a car that has worked for you in the past or is there a chance that a bodger has had a go at it before you?

Me too but i cannot find it.

i doubt it. To replace the ICV SM you have to take off the entire intake/iintercooler/tthrottle body.

I guess its my fault and i need to redo it

I think I am missing something here  was it OK before you took it apart?

nope the icvsm needed replacing

[Gaffers]

If it can see its overly rich at idle, it may try to let some air in...

Would fit with the symptoms. when cold the idle is normal speed just lumpy as f..... then after a minute or so the idle speed goes up to about 2k rpm without me touching anything.

Right next weekend its injectors off