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This model is prone to coil failures. What happens is the insulation on the winding's fails and they leak spark through the side under the metal shield. remove the coil and pull the shield off and look for any discoloration . If there are any marks at all on the side of the coil replace it. Also we see non- factory rotors burn out and short to the distributor shaft. Even though you have spark with the cap off it still could be the coil . When the cap and wires are all together there is more resistance an a bigger chance of the coil spark jumping. I have seen these short a coil by just pulling a plug wire with the engine running. Also you might need to remove and dry out the plugs when there is no spark the injectors still run and wet down the plugs .