Question: My '88 GT jerks back and forth when holding throttle steady at around 35-45 mph. Any other speed is fine, and it does nothing if I am accelerating or decelerating. Thanks for the help.
Answer: If the car is in a good state of tune, chances are you have a broken engine/trans mount or a worn torque strut (commonly called a "dogbone").
If the car is an auto, that is the speed area where the torque convertor lockup occurs and the slight engine speed change, in conjunction with the above, can make it seem as though something is wrong with the engine performance.
Of Course, something could be wrong with one of the engine sensors. A scan of the engine would reveal if that is the problem.
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