The voltage regular on the alt might be burned out causing a flux in voltage. Worst case is that you'll need a new alternator. Your output speed sensor might need replacement, as it has influence on the speedo itself. Your starter solinoid may also need replacement.
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1993 Dodge Spirit 2.5L TBI, 100hp
1999 Ford Taurus 2V 3.0L, 145hp
2000 Dodge Durango 360, approx. 285hp @ crank
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