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98 cadillac sls idling rough

I noticed that I had no engine oil this morning, after noticing the car idling rough the night before. I filled the car up with oil, but it is still idling very rough. The car has had a recent tune up, and the check engine light is not on. The car runs smoothly when driven at high or low speeds , but when parked or stopped at a light, it runs and shakes roughly. Help?

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  • 3 Answers

Try your ful injecton you mite have a injector clogged up try seafome it mite work cant hert to try

Posted on Apr 20, 2013

  • Daphnie Creighton Apr 20, 2013

    Ok thanks. Is this cheap? Is it like a fuel injector cleaner?

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2000 Lincoln Navigator with rough idling and service engine light

i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.

Posted on Jul 25, 2009

  • 583 Answers

SOURCE: Rough low idle in gear when stopped at a light.

probable vacuum leak query brake booster

Posted on Jul 26, 2009

  • 30 Answers

SOURCE: Very rough idle and low rpm and flashing service engine light.

Don't think it's major could be any number of sensors. Any autozone will run a free scan and point you in the right direction.

Posted on Sep 21, 2009

Testimonial: "Ill let you know."

  • 215 Answers

SOURCE: 1998 ford ranger idles rough, high then low

does car have engine codes? sounds like your idle air controle valve is sticking. or possible egr problem

Posted on Feb 18, 2010

  • 115 Answers

SOURCE: car idles rough in park also runs rough in overdrive

Sometimes a rough idle like that is a fuel filter. As you've already done the plugs and wires the fuel filter would be my next bet.

Posted on Mar 15, 2010

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