Aside from the k40, I think these cars are not designed to accelerate when you have foot on brake. Check the brake light switch. If its on it might be causing your acceleration issue. Whereas in neutral it doesnt come into play. Just a thought

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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