85 Nissan Maxima Rough idle

My 85 Maxima engine runs poorly, not always, sometime is OK. When start engine and get rough idle, turn off and restart may get good idle and may not.If get rough idle unplug the fuel pump fuse the engine can strangely becomes smooth idle for a long time (but can not drive).I wonder where the fuel comes from.

Need help, Any advice appreciated. Thanks.

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Mark_Ma
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