Question about 2004 Lincoln Navigator

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Hesitation during acceleration and rough running under power

My 2004 Lincoln Navigator is hesitating during acceleration, and running rough during continued power (usually above 35 mph). I've gone through 3 full gas tanks, so it wasn't bad gas. The engine has 79k miles on it. I took it by a shop for a quick estimate on a tune up, and the mechanic plugged into the car's cpu to check for codes. He said none came up. Is it just time for a tune up? What other services should I get. I've really only done the Jiffy Lube thing every 5k miles since I bought it 35k miles ago. I appreciate any advice. Thanks for your time!

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  • Phillip Skinner Apr 23, 2009

    Thanks! Yeah, sometime it can be cheaper going to the dealer...

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Go to a repair shop and have them hook it up to a computer only $45 to check and this will sove little things and huge things. Trrust me i know a lot about cars and I had the same problem even tho the check engine light did not come on or is on run the check you will be glad you did and tell me how it went. Thanks

Posted on Apr 23, 2009

  • Grand Canyon Tech
    Grand Canyon Tech Apr 23, 2009

    if you already checked for codes there is another check they do at the dealership they put the car on a treadmill hook it up to a totaly diffrent computer a litte more money but well worth the investigation to keep you from having to shell out money to people who dont even know and play guess work you could be spening alot more money.

  • Grand Canyon Tech
    Grand Canyon Tech Apr 23, 2009

    A tune up will not hurt as well check spark plugs, check also the distributer just because the computer has not detected the error does not mean there is not one hooking it up like i said at a dealership will solve alot of problem and you pay less that way then having to guess what it is that cost more money trust me. Thanks for letting me help you

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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

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2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

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http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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