4afc mis on mod-hard accel

[Supralux]

Hey,

I have a 4afc in a nova and it has a bad intermittent misfire when i give it moderate or hard acceleration. i have recently changed the plugs to correct a misfire which has worked but under load the engine still sounds like a tractor. any help??

[hosking1991]

ignition leads, fuel filter, ignition timing. carby could be due for a reco