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Most cars have a voltage regulator behind the dashboard that supplies a stable voltage for the gauges. Have a look, if you follow the wires from the gauges you will probably find one wire from each gauge going to a small regulator box. If you cant get a new one an electronic technician can build one for you.
Have you considered the throtle body injector? If the injector is not spraying a fine mist this will cause plugs to foul out and you will get the symptom you describe. The ERG valve on the back of the motor may be anothe cause during warm up operation. These usually plug up with carbon and do not work when you 100k miles or more.
Make sure you used good quality wires and plugs (not platnium, in these ones).
These are good engines. Even though fuel system has been upadated over the years, the gas mileage was great on these old birds. Not like the 17 mpg on the new generation dakota's today.