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Vw polo 2005 no power, no diag code?

I have a 2005, VW Polo 1.6. Afer start up it has no power at all, almost like too much fuel and no air / bad timing symptoms. 3 different scanners show no fault, have changed fuel pump (original), coils, crankshaft speed sensor, checked timing belt, tried 2nd hand EGR valve etct etc - driving me absolutely crazy. Has any one had similar problem or know which way to go next? ECU?
Any help welcome!
RJA, July 2009
link Click here to see other fixes for Polo.