I had something similar. Bottom line is they could not find the fault, but I have not had the problem since.
http://www.vwwatercooled.org.au/newf...ad.php?t=34078
They replaced the fuel injector but apparently the car was already back to normal before they replaced it when driving from the car yard back into the workshop to replace the injector.
One thing that DID get fixed out of all this is the "rattle" I get at low rpm has gone away. Presumably when they reassembled the various bits something got tightened up.
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