I have a 2003 Golf 1.9 TDI pd 100 with 120,000 on the clock.

When I have the engine running at idle , after a about 30sec to a minute, it starts to shake a little, like as if an injector is not getting enough fuel. It like runs smooth then after each 30 seconds or so it starts doing it again. If I increase the revs slightly it's ok and the car runs ok. Anyone know what it could be?

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    Is the AC on when it does this? – I have no idea what I'm doing Mar 17 '16 at 9:00
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    For understanding: You are saying the engine starts and stays running without issue. Then, on a very cyclic basis, will run rough for ~30 seconds, then smooths out for ~30 seconds, and will continue cycle like this until you rev the engine up some. After that it doesn't do it anymore until you shut the engine down. Does that cover it? – Pᴀᴜʟsᴛᴇʀ2 Mar 17 '16 at 10:39
  • Does the vibration change / cease if you press the clutch pedal? These cars have a dual mass flywheel and the first indication that they need replacement is a judder or vibration. – Steve Matthews Mar 17 '16 at 13:39
  • @SteveMatthews how would that explain the periodic nature of the shudder, though? – I have no idea what I'm doing Mar 17 '16 at 14:23
  • No the a/c was not on ,but did press it on and off to see if any difference but alas no there was not . Yes Paul, that about sums it up , and answer to Steve , yes I think I did press clutch pedal and it was still doing it , will check again on that though tomorrow and come back to you . cheers spike – Spike1947 Mar 18 '16 at 22:37

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