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I have a 1999 s-type auto 3 litre only 60k on it has been a great car and runner till the other day, went out for a drive and when i come to a stop at lights or in trafic the car idles realy rough and then some times just cuts out any sugestions please.

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T o me it sounds like an air leek. try the breather pipe on top of the engine and to where it disappears at back of engine, it has a elbow joint that is a known fault on S Types, you may have to remove it to find fault, usually a small crack.

Stan

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checked that one its ok some one has told me there is a breather pipe under neath the plennam that is known to split or collapse any one know if this is there or it is prown to collapse thanks

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There is a pipe there as you suspect, I have read a number of comments on other forums about this, but, before you delve in too deeply to the engine bay have a look at the pipework at the front of the engine just past the air cleaner ssembly, the vac tube here on mine had a split underneath which was not at first glance obvious, only noticed when flexing the pipe and trying to hear any air leek or hiss As a temp fix i used insulation tape to bind the split,that was some time ago, the orange  performance light went off and it has been ok ever since, have you had any warning lights/ comments  come up on the dash?

Noel

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I am still positive it is an air leek. That beather pipe I mentioned is not blocked is it, it has a restricter at each end of only a few mm. so it will show same fault has a leek. I had same trouble. Have you had the codes read with obd2 tester.

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