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My car is idling rough going up and down.

Tiny
KATASH
  • MEMBER
  • 1998 HYUNDAI ACCENT
  • 109,000 MILES
Hi my car is idling rough going up and down slightly more when I put my window up or down or indicating and it seems to be using more fuel than it used to used to get 60 miles or so on 10 pound but only getting about 35 to 40 now plugs bin changed coil ok oil ok what could it be thanks
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Saturday, December 8th, 2012 AT 4:57 PM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is the Malfunction Indiator Light showing?
Was anything done prior to this occurring?
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Saturday, December 8th, 2012 AT 7:52 PM
Tiny
KATASH
  • MEMBER
  • 3 POSTS
No lights are showing.
Nothing has been done to the car prior to this. It has just started doing this, just cant understand why I am using so much fuel and why its idling roughly, the revs seem to drop as if going to stall but goes back up again. It is constantly doing this at idle, yet the car drives fine.
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Monday, December 10th, 2012 AT 5:21 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Vehicle needs maintenance and if it is not running well, you need to check. If you are not a mechanic, you definitely would not understand why.

Start with the basics, have atune-up if it is due. Check the spark plugs and related components.
Clean the throttle body and IAC.
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Monday, December 10th, 2012 AT 8:16 PM
Tiny
KATASH
  • MEMBER
  • 3 POSTS
Thanks. Will be trying that soon
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Monday, December 10th, 2012 AT 9:03 PM

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