Hi

this type of problem has been posted quite a few times, and I have spent close to a week searching for a possible result for my case, have not found it yet. Summary bellow

1. Car started of by going into rough idling/acceleration occationally, and reset to normal after a re-start.

2. I have already, (15-months ago) changed the Wiring Harness to a brand new one, even thoough at the time there were no issues obvious issues, but an oil leak work revealed best to change than wait.

3. Not expecting it would be another harnes issue, I decided it was time to change the plugs, tranformers, plug cables and boots. I changed all. Vehicle now idles, and accelerates rough constantly. In particular plug number 5 does not seem to be firing, as seen by foul plug face when removed. Kind of looks a little wet.

4. Took it to dealer to see if they can isolate the problem, but after two hours, said they need to do a lot more diagnosis, and need a full day with the Car.

Question: Is there a simple procedure I can use to double confirm that Cylinder 5 is the only issue, and also what could cause only a single cylinder to not-fire, any remedies suggested?

Check engine light read by dealer only says "numerous misfires" they will not tell me which cylinder is misfiring. Even though I think its #5 from what I saw/stated above.

Any help is really appreciated, unfortunately not a very good time for me to spend lots of $$$ on 3days with a dealer.

thanks in advance