Might be a wee speck of dirt or rust blocking one of the Grose Jets slightly
open, causing an over rich mixture at lower RPMs. Pull the float chamber covers
and the Grose Jets and hose the jets down with carb cleaner.
Good luck,
Jerry Causey
1967 MGB GT
> My 74 midget has just fallen off my Mr. Reliable list. New intake manifold
> gasket, new vacuum advance for the distributor, fresh gas, a bottle of Heet
> for good measure and I still get the worst idle imagineable, about 500 rpm. He
> starts fine and out on the road accelerating at about 1200 rpm all of a sudden
> he clears out and runs fine. Grose jets in the float chambers and recently
> tweaked carbs and choke adjustment. I removed the charcoal canister and blew
> out the lines for the carb breather and there was no blockage. Help,
> suggestions and advice appreciated. Valerie Stabenow
>
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