2000 Windstar Shaking
When driving van, the front end shakes. At 40, 50 or 60mph once you level off on spreed it shakes. It feels like your going down a dirt road. You have to speed up or slow down to stop the shaking, so your speed is constinently going up and down. Several mechanics have tried but can't figure it out. New spark plug & wires, new coil pack, new cv axles. I took it to the transmission shop and they said it wasn't that. Check engine light is on and so is the ABS. Please help us.