If its idling rough then it could be because its only running on 2 or 3 cylinders, check for damp in things like the dizzy cap, and spark plug tunnels.
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I jet washed my engine
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(something i wont ever do again!!) and i got loads of water in the system, it all seemed like a really good idea at first, soon changed my mind! it took ages for the water to completely get out of the system, a good week or so with regular runs.
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If it hasnt been done for a while, then its worth just changing the leads and plugs anyway, give it some tlc! Failing that, try moving the ht leats about and see if it suddenly perks up.
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If you get no joy, remove one plug at a time, if the car stalls you know its a good one, if you get no change at all then its there.
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Cheers
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Mike