Quote:
Originally Posted by shogunther
I am getting intermittent spark at the coil wire not the plugs
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Everything I wrote still stands. The coil wire feeds all the spark plugs. If all of your terminals are blackened it could indicate excessive arcing inside the cap due to the higher voltage the plugs are forcing the coil to push out.
The fact that you are seeing an intermittent problem makes it a bit more difficult to diagnose, but you always start with the easiest things first. It's far easier to swap in a set of plain jane NGK V-power plugs to see if that takes care of the issue than it is to start tearing into the wiring harness. Besides, running those iridiums virtually guarantees you further ignition problems in the future.
You haven't told us what sort of driveability issue you're trying to fix here. If there was an issue with the ignition switch you would most likely experience stalling since you would most likely be losing power to the coil, but I'm far from an authority on the details of the engine management wiring.
Again, stick with the simplest things first. I've seen people spend hundreds of dollars not fixing a problem that I took care of with a 7 dollar part.