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It sounds like you may have an issue with either the low speed jets in your carburetors or low compression in your engine. Do a compression test of the cylinders. You should see a reading of at least 115 psi in each cylinder, with all cylinders reading no more than 15% apart. If the...

It sounds to me like it may be an idle air control valve (IAC Valve) The IAC valve opens and closes to keep the engine at a constant idle by regulating the amount of air going into the engine. You can check it out by putting a credit card over it and then sliding it back and forth to allow...