Blowback through carb

[David Stepney]

I recently had a similar problem on my RP saloon. My car is perfectly standard with a Zenith 26VA carburettor, so i cannot guarantee that what i found will be you problem. My car also spat back occasionally when pulling hard. I eventually traced it to a worn distributor top bush which was allowing the points gap to vary from 12 thou to virtually nothing. I cured the problem temporarily by opening the points gap a bit before obtaining a refurbished distributor.