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[vbelen4]

Time ago I experienced erratic idle. Discarded ICV, etc, finally it was due to a defective ECU temp sensor.

[Smooth]

also tried cleaning the breather pipes and no avail,doing my rather head now,no codes present,have tried a bottle of engine treatment in the tank today,hope this helps,anyone any ideas....cheers

[Andy H]

Has anyone got Tech2 or "My Naff Code Reader" in NI who can look at live data for you?

When SWMBO got a Golf last year it had similar symptoms. I spent ages checking for air leaks before getting a tool to read live data which told me that the throttle wasn't closing when it should.

Turned out that some clown had glued a sliver of wood inside the throttle motor to prevent it closing properly. This had been done to mask a stalling problem caused by a faulty temperature sensor

Removed the wood, replaced the temperature sensor and cleaned out the breathers and order was restored

I would start by checking that there isn't a problem with the brake servo or the vacuum pipe. I can think of other things it might be (temperature sensor, throttle motor) but it doesn't make sense to swap things unless they are known to be faulty.