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OK then it's not the plugs, trust me on the prices of copper plugs as opposed to platinum or other metals. As far as checking coils you would need an ohmmeter and know how to use it. FSM says Check resistance between pin 1&2 if not zero ohms (shorted) then coil is OK. I would compare readings between several coils they should all be fairly similar. Anyway if you have faulty coil you should throw a code saying which cylinder is misfiring. If that happens then you can swap coils and see if trouble moves to another cylinder. With no code this does not work.
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