5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 01-22-2008, 07:37 PM
  #1  
steve r
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When I turn my key to start it therpm's on the tach will jump to like 2000 then fall down then start? it only does it sometimes....any ideas?
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Old 01-22-2008, 08:02 PM
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mjr46
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Default RE: starting question

depending on the temp it should idle up if it's cold enough outside...I'm not quite sure I Understand your problem??? does it not start or just when it does it idles up high briefly then drops?? correct??....try cleaning the IAC if so
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Old 01-22-2008, 08:12 PM
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steve r
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Default RE: starting question

when I first turn the key to start it the rpm's on the tach will jump up fast while the car is still off but trying to start than the rpms will drop and start
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