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The exhaust might shake, not the motor I had dual side exhaust on my 88 350 ran sweet!
The energy being released in the engine is not transferred to the outside; it manifests as vibration, which is transferred to the rest of the vehicle, hence the shaking of the car.
could be a vacuum hose leak--had the same problem and once the hose was replaced it stopped.
you most likely have warped brake rotors
Shaking at idle is usually caused by worn engine mounts. It may also be caused by the exhaust system coming loose and touching the frame somewhere.
Not the steering wheel shake itself, however what is causing the steering wheel shake, can certainly be extremely dangerous and potentially cause you to lose control of the vehicle. **GET IT CHECKED OUT BEFORE THAT HAPPENS**
could be a broken engine mount
This question can be referring to two separate conditions. If the steering shaking while the brake pedal is being applied the condition maybe warped rotors. If there is steering wheel play while the vehicle is stopped and or moving it is an indicator or worn or failed column components.
because it is old as a grandpa
They stopped because nobody watches it anymore because its stupid.
Combustion leak detection. The liquid changes color from blue to light green when Carbon Dioxide (in exhaust gas) is passed through it. It tests for leaks from the vehicle's head gasket(s) or cracked engine block into the cooling system. The head gasket is the culprit in most all cases. Also, if there is exhaust gas in the cooling system, usually there will be other indications of head gasket or block failure, such as white smoke from the exhaust (coolant vaporizing in the combustion process), oil in the coolant or vice versa (is known as the "chocolate shake" where the coolant or engine oil starts to look like milk chocolate from the two mixing), and/or bubbles in the coolant reservoir while the engine is running. The Combustion Leak Detector will tell you in no time.
Tires may need to be balanced.