My educated guess would be that the speed sensor is broken and reading slow, so the cruise control unit doesn't know what speed the car is actually going. Go to your library and see if they have the shop manual for your car. It will have the exact answer. More than likely, with the primitive chip, the computer had it engaged at 72. then something happened, an accident, a jolt, lighning (not likely lightning) or something shorted out, freezing the chip at 72. if you replace the chip, it should do the trick. Hint, a simmilar thing happened to me.
To the left of the steering wheel, below the dashboard is a button that says cruise control. Push that button in, the dash will illuminate the cruise control light. Then, as you reach the speed you want to cruise at, push the button on the steering wheel that says "set". When you want to turn cruise control off, simply tap the brake pedal and the cruise will go off.
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