Aidan Birley
Always worth cleaning & resetting throttle body on VAG.
As said check for air leaks, including any breathers & vac pipes.
May be worth checking valve timing, this set up used to suffer from idler pulleys failing allowing belt to jump.
Aidan
Message Thread 
VW Polo 1.4 BKY 2006 - Loss of power and surging - Fixed # - Dave Emm February 27, 2013, 11:31 pm
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