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Old 12-09-2012
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By the sounds of it, you have gotten what into and around the spark plug/Coil Pack, for the number 6 cylinder. Whip the plugs out and take the leads of everything and let it sit in the sun with bonnet open for a while. Have a look for scorch marks on the ceramic insulator on the spark plug. Probably best to change the plugs whilst your at it, and if there is serious scorching on the plug, you will be best to change the leads as well. If that doesn't fix it you are possibly looking at a new coil for Number 6 Cylinder.

If thats not it. Hopefully someone else will be able to chime in with some Suggestions