I think it is a comp prob.. do u have ASR?? maybe accelerator position sensor?? I dunno man jsut leave it i guess.. mine did the same for a while but only when i beat on it.. after i restart it its fine... happy benz'in

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Turk..
00 S500 W220
93 300SE W140
01 C 240 W203
86 SVO Mustang (Turbo Pwr'd.. hehe)