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hypertech chip

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Old Jun 11, 2010 | 12:44 AM
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johnny89345's Avatar
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Car: 1987 iroc z
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 342
hypertech chip

a friend of mone just gave me a brand new hypertech chip he had laying aroun for my car....only god knows why he had it anyway i plugged it in and the car would not start. the i unplugged it and put it back in and it started and ran great till i shut the car off. then it would not start again. i put the stock prom back in and no more starting trouble. what would cause this
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