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2002 Dodge Dakota High idle at start, up & down for a f

Tiny
CMJ
  • MEMBER
  • 2002 DODGE DAKOTA
  • V8
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
High idle in the morning up & down from 2500 to 1500, will even out in a few seconds or when it is put in gear, doesent seem to do it when I'm driving or after the truck is worm. I thought it might be the EGR valve or the throtle poisting sensor but have also been told it could be a vacume line. I do most work myself and can do any of these jobs but dealer wont take parts back if I guess wrong. Just trying to save a buck.
Thanks
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Sunday, September 27th, 2009 AT 6:56 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It could be several things. First, I don't think a vacuum leak would cause that much of a change in RPM's. Has the check engine light come on?
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Monday, September 28th, 2009 AT 8:19 AM
Tiny
CMJ
  • MEMBER
  • 2 POSTS
No it has not buttonight at a red light it felt like it was going to stall. The rpm's droped below 1000 and they are always steady at 1000 when I'm not on the gas.
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Monday, September 28th, 2009 AT 7:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If the check engine light didn't come on, chances are it is fuel related or a vacuum leak. If you haven't checked for leaks, start there. You may also want to check fuel pump pressure. Here is a how to for doing so:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find.
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Monday, September 28th, 2009 AT 9:06 PM

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