Question about 1998 GMC Yukon

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Hesitation / missing / car shakes

I have a 1998 yukon with 252,000 miles. New factory transmission at 160,000, K&N cold air injection kit at about 180,00, tune up at 200,000. Cold air injection was great for performance. My problem now is while accelerating up a hill (more load on engine) it will start hesitating, then vibrates the whole car. I cannot tell if it is a serious missing (engine) or transmission. When you back off of it, it will continue to shake car for about a 10 th if a mile and then smooth out. Is this most likely an engine / tune up problem or transmission?

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  • Anonymous Oct 28, 2008

    I have a 1998 Yukon with 143,000 miles. Every once in a while it will start bucking like crazy at speeds around 60. Let up on the gas and it will stop. It may not do it again for weeks. Seems to be shifting ok. Ocassionally I get it at slower speeds. If it doesn't do it for the mechanic, what can you do?

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  • 195 Answers

Hello;
The problem is most likely break down of the spark plug wires. The demands on the spark during acceleration and load destroy the wires as they age. I would start there. Hope this helps.
Thanks;
Rich
RPM Northwest

Posted on Jan 28, 2009

5 Suggested Answers

  • 1 Answer

SOURCE: Hesitation on acceleration

Sounds like Coil packs are not sparking correctly remove rubbers and check for cracks.

Posted on Jan 04, 2010

  • 5 Answers

SOURCE: 2002 ford windstar..hesitates or stumbles under load like hill

did you have code cleared and also try fuel injector cleaner, as a clogged or dirty injector can show as a misfire,

Posted on Mar 16, 2009

  • 27 Answers

SOURCE: problems with acceleration - 2001 Yukon

Most likely it is due t5o dirty fuel injectors or bad mass air flow sensor

Posted on Jul 23, 2010

  • 1 Answer

SOURCE: acceleration hesitation

Depends how long since your last tune up and mileage. I would do a normal oil change, oil filter, air filter and plugs. If she still does it, try checking for a vacuum leak. Start the vehicle and spray "lightly" carb cleaner around your vacuum lines. If you have a leak the engine will increase in idle suddenly. Replace the line or part. AS A LAST resort and pretty rare is the distibutor. They usually run about 75.00 to 110.00...hope this helps.

Posted on Jun 30, 2008

jonnyb69
  • 4 Answers

SOURCE: 2001 chevy monte carlo power loss

change fuel grade.if that dont do it. i reccamend a tune up

Posted on Oct 27, 2008

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