A universal joint on the driveshaft going bad.
lose washer
Bolts might come loose from the transmission pan while you are driving your 1987 Ford Aerostar because they have not been torqued to specified tightness. They might also come loose because the bolts are not the right size or are worn.
Yes, either can cause a shake while driving.
the breake
Most commonly a vibration while driving is from a broken belt in one of the tires, but if it's vibrating while sitting still, it's usually from loose motor mounts and/ or a higher than necessary rpm
mobile phones
The correct answer is : drinking and driving
Adding heat causes gas molecules to vibrate, increasing the gas volume or pressure. A car with a damaged valve will usually vibrate noisily while operating. Tuning forks are designed to vibrate and thereby create a particular pitch.
Bad tires or out of balance tires or driveshafts. Have it checked out.
Loose motor mounts.
Drinking while driving
Oil in the distributor.