When pushing accelerator pedal the car makes a vibrating noise what is this?
A general rule of thumb is that "vibrations" are caused by spinning parts. As opposed to knocking/clunking noises which are caused by linkages and bushings and such. Since you feel it only under acceleration, I'd look at the center supporting driveshaft / flex disks. MB has some outstanding TSBs on the issue: "A vibration felt through the center floor of the vehicle can be caused by cracked and/or shredded driveshaft flex discs, resulting in excessive driveshaft movement. If not repaired, damage to the driveshaft center support bearing, transmission, or differential can occur."
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