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Sometimes, the car thinks the runway is too short and jumps so it won't crash at the end.

Also, consider checking engine mounts, transmission mounts, cradle mounts (if FWD) and CV joints and U-joints. Engine mounts and cradle mounts would be the most common causes that I've seen.

If the car is FWD, consider lightly powerbraking in Drive with the hood open and look for excessive movement suggesting a torn or weak motor mount.

If this is a Taurus or Sable, be very gentle so as not to rip the radiator or upper radiator hose. Check the mount descriped in the next paragraph for being ripped, or having a loose mounting nut. Also pay close attention to the front two cradle mounts. These very commonly rot away and cause a lurch. If it is a Taurus or Sable, replace the radiator and upper hose after repairing the lurch to prevent overheating later on. They are both already damaged.

If this is a Cadillac with a 4.5L or 4.9L engine, expect it to be the motor mount at the right front of the subframe (left front of the engine) or a CV joint of the right axle shaft.

Other less likely suspects are damaged:

strut rod or radias arm bushings, especially on Ford vehicles

ball joints

strut towers (cracked)

upper control arms (rotted or cracked) if a GM S/T truck, expect a brake pull

upper link on Mazda Millenia front suspension

strut mounts or strut bearing plates

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Q: What would cause a car to jump when taking off?
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