possibly a broken or missing engine mount
the engine mounts could be bad
Engine mounts
The pistons are running in the cylinders of the engine, so when the rpm of the engine rises, the pistons quickley build up speed. It is this rapid acceleration of the pistons that casue the car to shake.
Engine miss or rough idle, or broken motor mount
Failure of the engine or out of petrol
a bad engine
major vacuum leak?
The car might need a tuneup . also the problem might be related to fuel injectors that are not working properly.
No, not unless it is so low the engine is overheating.
Due to the fact balancing the engine would be impossible. It would shake itself to pieces if it ever ran. It would be very heavy, shake the car apart and have no torque
no.an engine can run on 3
The car has a problem with the engine. My first and probably correct guess would be a blown head gasket. The symptoms are exactly what you mention.