1975 Fiat Spider- Stammers at low rpm under load

I have a 75 Fiat Spider. Recently it started stammering at low rpm under load. I thought maybe a fuel supply problem, but I have verified that fuel is getting to the carb (and is able to travel back through the overflow). I have rebuilt the carb and tried another distributor. Have also tried a new fuel pump. None of these seemed to help. I seem to be ok at idle and high rpms (>2500).

Any ideas? I am starting to pull my hair out.

Thanks,
Paul
(stahara@alltel.net)

Hi Paul

What type of carb do you have ?
have you removed and blown out the jets also blow through where the jets go.


1970 124 AS Spider
1973 124 CS Spider

Nothing comes to my mind about this weird problem...anyway I assume you've already checked spark plugs and cables[8D]!Is the distributor correctly set?I think it's something related to ignition, and I'd not reject the idea of an head gasket gone...because you said the engine stammers at low rpm and FULL THROTTLE,which can allow water to pass inside the cilinders[xx(]!