Technical Gas pedal shaking when accelerating

[neonglow]

Sometimes, more often recently, when I press on the gas pedal and start accelerating it starts shaking, sometimes pretty noticeable. I can see and feel my foot shaking from side to side. When I go off the pedal the shaking stops. This occurs across the whole rev range and happens when driving on both gasoline and LPG. There is no shaking or clattering when driving down a hill in neutral for an instance, so it's not related to tires, brake disks etc. This shaking occurs only at high speeds, haven't noticed it while driving around town. Has anyone had a similar problem? I suspect engine/gearbox mounts but is there a way to see if the rubber of the bushings is torn?

Another clue:

when I first start the car in the morning and put in first and try to take off while slightly releasing the clutch pedal the front of the car/engine starts shaking up and down pretty wildly. This goes away as soon as the temp needle moves for the first time.

I am getting really woried that my engine might fell out Aside from this shaking sometimes runs normally and pretty quietly.

Thanks in advance!

 

[neonglow]

This one is solved too after changing the gearbox bushing