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Re: engine light stays on
There is no such thing as an "NGR" valve, but there is an "EGR" (Exhaust Gas Recirculation) valve. You can take the car to any National auto parts store and have the DTC's (codes) checked for free. This sounds like secondary ignition misfire to me i.e coils, wires or plugs. Let us know what codes you discover and we can make a better judgment.
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