I had this problem a few weeks ago after changing the spark plugs and wires on my car, luckily I found a thread about it.
My Haynes manual show cylinder 3 + 5 cables round the wrong way on the distributer. Maybe it's correct for an older model.
I swapped them over on the distributer, and it runs fine.
I don't know if this is your problem, but good luck!
Edit:
Firing order for my 8G, on the distributer respectively:
4-------3
2-------5
6-------1
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