i dont have a giles pump (i dont think) and it did a similar thing. either it idled high, at like 1100, or way way low, at like 5-600.. i could fire it up, let it sit, idling at 5-600 for like 5 minutes, then out of nowhere, by its self, the engine revs up to 1100 and stays there. the only way to bring it back down to that real low idle is to drag the clutch.. and thats only if its still halfways cold. if its completely up to op. temp, then it will just idle at the higher speed.
...BTW your Bieber avatar is awesome.-Malone
I think you need to read this threadhttp://www.vwdiesel.net/forum/index.php?topic=7218.0It sounds like you are trying to adjust the residual fuel screw, not the idle. It depends on what pump you have though (I can't tell from the picture)