1.8 Misfire Whilst idling and also driving

This 1.8 k series I have has been fully rebuilt down to every bolt, ever since refitting and starting I've had a misfire with it, after a while it disappears and is fine but when it does misfire and I'm in 1st its so sluggish and then it will just bolt and be ok, but when you change down gears it plays up starting to cough and fart, the only thing I can think of is it being a fuelling problem.



What do you guys think, BTW its a dizzy cap model and its new with new leads.

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