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Fuel Shutoff Valve according to all the articles, however the switch operates the valve and the valve tells tales back to the ECM. You would need a pro grade scan tool computer to diagnose against known voltage values.
The 3.1 Engine has a small brass bleeder located in the pipe that runs from the water pump across the top of the valve cover at the front of the engine, as well as sometimes located on the thermostat housing.
Symptoms of a bad EGR valve are usually stumbling idle or the engine stalling when the car is warm (normal operating temperature). Find the EGR valve and locate the vacuum line attached to it. Start the engine cold and wait for it to warm up. When the engine starts to stumble, pull off the vacuum line. If the EGR is bad, the engine idle will stabilize and no longer stumble.
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