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I had same symptoms on 92 lumina. replaced. fuel pump,sensors,everything. turned out being the fuel regulater located under the plentom. check the plastic line leading to it for fuel in line and replace regulater.after 9 months of trying it was fixed.

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Q: Why does your 1990 Chevrolet lumina cut off atfter operating temperature but before it cuts off it starts to have a miss to it in the engine maybe the ICM Idle speed sensor crank shaft sensor HELP?
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