I would have all tires balanced. Make sure all lug nuts are torqued correctly. Check each wheel to make sure one is not bent. Check the drive shaft for worn U-Joints or a bent drive shaft. Check the exhaust system to see if some part is loose or vibrating against the frame. Check the engine/transmission mounts for a broken mount. If the vibration is coming from the rear replace the fuel filter. A fuel pump that is working hard can cause a vibration. It can also be a fuel pump that is failing.
Pinched or blocked transmission cooling lines
Loose or worn out serpentine belt.
Drive line vibration, it is possible that your drive shaft/axle are now out of alignment which would cause the vibration. I have the same problem with a 2 inch lift in a 98 Cherokee. I am going to try 2 inch shims (there angled i.e. little triangles) that fit on top of the axle between it and the leaf spring. Hopefully it will fix the problem.
Yes
Depending on which circuit Could be defective component Vibration causing a wire to short to ground
Heating and cooling Vibration
Having the speedometer jump and the engine stall in the 1994 Jeep Grand Cherokee Laredo could be a problem with the idle and the transmission. The transmission slipping can cause the speedometer to jump.
Pinched or blocked transmission cooling lines
Loose or worn out serpentine belt.
Yes, if it is leaking and the coolant level is low.
Try balancing the tires,
Heater core
It could possible that you broke a motor mount. Depending on whether the vehicle takes any abuse or not. Or it may just be loose.
Throttle position sensor
the switch board could be bad.
more than likely you have a short in your wiring
Yes