garvitron, first off--there is no real mechanical difference between a 2001 AWV and any year AWP--it has the exact same turbo (KO3S)--the extra HP of an AWP is all ECU programming. The KO3 turbo was stopped at the 2000 model year. An AWP run on AWV ECU and programming would make 150HP--your problems have nothing to do with your replacement 1.8Ts engine code. So, you have other issues--go to Autozone and get the codes pulled and come back w/ a code number...but, off hand "fluttering" sounds like a bad DV (divertor valve). If it's actually surging it could be an N75, vacuum leak(s), wastegate function, etc.
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