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I am sorry your having this problem
has anything been done yet to correct this issue yet ?
can you tell me the year and model and engine size ?
I think that there is a vacuum leak on the intake system, either the carburetor base gasket or the intake manifold gasket may be leaking between the manifold and the cylinder head. Also check foor any loose or disconnected vacuum hoses. If the engine has an EGR system, the EGR valve may be sticking at dile when it is supposed to be off.