Do a compression test and 'sniff' test just to rule out anything nasty.

I changed the plugs today from the old Fiat/Lancia type to NGK and the misfire has disappeared.

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Ad, goes to show that 99% of issues are the simple things! Glad its sorted!

Nice to hear a simple solution!

Yeah I'm glad too, I was nearly tearing my hair out! Must have always been a faulty plug on cylinder 3 even from new! NGK have never let me down.

I just want to take this opportunity to thank every one for their input, you have all been very helpful.

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Top stuff. Glad you didn't have to start pulling the head off it

Not as glad as I am

afroking said:

I changed the plugs today from the old Fiat/Lancia type to NGK and the misfire has disappeared.

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Btw. what plugs did you go for?

I went for NGK BKR6EZ. They are standard 'R' plugs.

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Glad to hear it's sorted. I also found the NGKs marginally better.

F1 use NGK's so I guess they should be the best.