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When I'm sitting at a stop my car idles very weird, it will dip down to like 500 rpm like its gonna die, when that happens everything dims then it comes back to normal in a second, and the weirdest thing is when this is happening my speedometer will shoot up like I'm accelerating really fast.... it will go up and down, from like 20 mph to 0. Makes no sense at all... Oh yeah and just last night for the first time it shut off on me but started right back up. This idle problem has been intermittent for the past I'd say few months but now it's just getting worse. And another weird things is when I'm stopped on a slight incline, the problem almost always happens with the speedometer thing. Any ideas?

P.s. its a 2002 taurus with the duratec.
 

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Speedometer could be a bad vehicle speed sensor.

As for the idle, I would clean or replace the idle air control valve.
 

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MY car did that off and on and it even stalled once, but it fixed it self and never set a code.
 
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