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Honestly this sounds like what happened when I was installing a fuel pump switch. When the fuel pump wasn't getting enough continuity the engine rev freely, but the idle was extremely rough. The engine would go down to about 400-500 and stay in that range. The lights on the dash would go on as if the car had died, but the engine would barely stay running.
If this sounds about right, I would think to check the fuel pump and the wiring going to it.
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