either the idle is set too high or your timing is advanced too far.
Check the motor mounts.
Well, voltage wise, you have a lot going on when your are cranking over the engine, so some flutter, or shake is normal.
YES it can, but the engine would vibrate and shake if it did.
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.
if this happens at a certain speed it's probably the alignment of the tires.
Try checking your engine mounts and bolts. On my Engine was it a misfire condition,the sparkplugwire from cyl #6 came loose I have a 96 Camaro RS 3.8 L.The other time it was a small Vac Line by the Throttle body,that caused a bad shake
bad engine mounts
sounds like you need a tune-up
One or more cylinders is probably not firing. It's like ceiling fan turning 2000 RPM with one blade missing. Check for spark on all your plugs.
Miss or vacuum leak.
Most definitely. Any miss will cause the engine to shake. A vacuum leak will also cause this.
Many things could cause an engine to shake. One, for example, would be low coolant or oil levels.