I would say before you start dataloging. pull the plugs and see which one is fouled up and which smells like raw gas and go from there. Then replace the plugs. I would try disconneting the injector from the cyclinder that had the fouled plug and see what happens. If it more than one fouled plug than you could have a coulpe injectors bad or some bad plug wires. Measure the resitance on all the plug wires and make sure none are rubbing against anything that may have shorted them.
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