While driving (1992 500SL) I notice that I was unable to accelerate when pressing down the pedal. A while latter the car began to loose speed and I was unable to accelerate. There where no indicator, or warning lamps on. The transmission engages reverse (R ) and (D ) but will not the when pressing the accelerator pedal the car will not accelerate.

Is this an automatic transmission problem? Or an accelerator pedal problem?

Please advise

You may want to check and make sure that the throttle cable is attached under the hood. I have seen them come loose before. If it is on, you have a problem with the electronic accelerator, but it should be in the limp mode so I think that it is cable problem (mechanical failure and not electronic)

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Benzmac:
1981 280GE SWB
1987 16V
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You're right, the mechanic diagnosed the problem: The cable connecting the accelerator pedal to the fuel distributor module broke at the point were the module and cable attach.