Rpms increase and decrease while driving

2005 JEEP GRAND CHEROKEE
175,000 MILES
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DAVEC1953
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  • 2 POSTS
My vehicle will increase rpm's to 4000 then decrease. When it goes up again, it clunks. Speed remains pretty much the same.
Mar 18, 2018 at 9:40 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Good morning.

Does this happen with the engine in neutral or while you are moving?

Roy
Mar 19, 2018 at 1:45 AM
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DAVEC1953
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while moving. noticeable when driving in the highway, fifty to sixty mph.
Mar 19, 2018 at 5:38 AM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Okay, that sounds like the transmission is not shifting from a lower gear.

Does it have any codes set?

Roy
Mar 19, 2018 at 6:34 AM