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Engine runs rough RPM's jump like it want to downshift

Discussion in 'Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)' started by rminiger, Jun 21, 2005.

  1. rminiger

    rminiger New Member

    I have a 96 tahoe that has been running rough off and on. Traveling @ 45-55 light on the accelerator with little to no load/strain the engine "bucks" and the RPM's jump a couple hundred then returns back down to where it was. Occasionally the service engine light comes on. Sometimes it doesn't. Been to the dealer 3 times for a diagnostic. Nothing identified.

    Almost acts like it is trying to downshift.

    Any advice?
  2. ARNIE

    ARNIE Rockstar

    Some of these issues are hard to daignose online, especially when you cannot get a code. My first thought though is a tranny issue. I would suggest you go to a good transmission shop and let them have a look at the prindle switch. As well, a bad torque converter and several other things could cause that. I would hate to see you just start replacing parts at a big cost and still not have the issue resolved, that is why I am suggestiong a tranny shop.
  3. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    Just curious if there is an update for this issue?
  4. Robbiev

    Robbiev Member

    I had a similar problem in my 02 yukon. Tranny shop put a shift kit in and it fixed the problem. Some to do with the lockup gear not holding because the piston is aluminum and the case is steel. SHift kit installs a steel piston.
  5. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    How hard does the shift kit kick in when shifting?
  6. Robbiev

    Robbiev Member

    It does not seem to bad to me. I have driven other tahoe's and yukon's and it feels pretty much the same.
  7. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    Well, they are smoother than they used to be. My Suburban has a shift kit, and it kicks hard if the RPMs are up high enough. Like getting kicked by a mule.

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