Did you take a pipe cleaner and clean out the nipple??? I think I got the TPS code also when mine was surging on the freeway. Can you get yours up to 5000RPMS? Mine would stop short somewhere around 4000-45000RPMs

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD