From most to least likely but not a complete list:
It is the engine that is vibrating and it is just being felt in the steering wheel. Can be a vacuum leak, or miss in the engine.
A car's steering wheel will vibrate when driving if the car's alignment needs to be adjusted.
In the power steering box. It is on the left side of the engine under the engine cover. It has a steering wheel on it.
get a wheel alignment
under the steering wheel
the motor mount is bad
Normally it is a tire out of balance. Can also be a bent wheel.
look under the steering wheel or in the engine compartment
A shaking steering wheel and engine while idling can indicate issues with the engine mounts or the power steering system. Worn or damaged engine mounts can cause excessive vibration to transfer to the steering wheel, especially when the engine is under load. Additionally, low power steering fluid or a failing power steering pump can lead to erratic steering responses, contributing to the shaking sensation. It's important to have these components inspected to ensure safe and smooth vehicle operation.
You possibly have warped brake rotors on the front. Or Bad Wheel Bearings.
could be a blockage in your fuel lines.
yes