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Are you sure the battery is not weak? The car will still start with the airbox out, even if the MAF is unplugged.
disconnecting the battery does not clear faults on a VW
Immoibilizer on these will allow the car to start, then die in a few seconds.
You don't need to do anything extra to bleed the ABS pump, just bleed all four brake lines and that clears all the lines. The lines pass through the ABS pump.
Did you try jumping the battery?