No real sensors in the intake area on the M103-12V....
Everything from the pedal to the throttle body is mechanical...

Have you remove the air cleaner assembly to see if the accelerator linkage allows the throttle body to fully open ?

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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES