High RPM at start & won't start after warmed up

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sharpie

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I have a 2001 Saturn that starts when the engine is cold but the idle is about 1500. While driving the rpm remains very high. After the engine is warmed up, it is very hard to restart, but if you push accelerator to the floor it does try to start. The temp gage stopped working today. I have replaced the throttle position sensor, but it was no help. Any ideas???
 
I have a 2001 Saturn that starts when the engine is cold but the idle is about 1500. While driving the rpm remains very high. After the engine is warmed up, it is very hard to restart, but if you push accelerator to the floor it does try to start. The temp gage stopped working today. I have replaced the throttle position sensor, but it was no help. Any ideas???
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Coolant temperature sensor.
 
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