420 SEL Will not idle down - help

When we idle down the engine, it cuts out on initial acceleration. It is ok after it gets going. Any suggestions. Thanks

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Does the problem occur only when the engine is first started (cold) or after it's been driven (normal operating temp.)?
Either way it seems like fuel starvation, the difference between the two cases (cold or hot) is the system involved.
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Does the problem occur after a cold start or after the engine is hot?
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