Is this normal or could it be a problem?

This car probably has a 4.9L or 5.0L engine. You might want to check the vacuum lines. Also the motor might shake at idle if in need of a tune up. Like spark plugs and wires might help. Also do you have Brake pedal pressure? Or do you have pedal fade or pedal slowly dropping to the floor. If so you might have a leaking brake cylinder or bad master cylinder. If it has allot of mileage then this could be age but really need more Information to know for sure.