p0505 =
When my v6 was acting up, I just changed the spark plug wires, spark plugs, distributor cap and rotor. Sound like you might have a wire that arc's off of your engine. That was my problem anyway.
I also noticed, when I did the distributor. I had some major buildup on the caps contact points where the rotor meets the cap. I would recommend changing all of this if you haven't yet. I think its recommended to do it with the timing belt intervals.
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