truck revs when in fouth gear

Discussion in 'Chevy C/K Truck Forum' started by 99ta350, Oct 27, 2011.

  1. 99ta350

    99ta350 New Member

    When ever i get into 4th and start to coast along my tack starts going up and down. I can feel it rev and the truck feels like its down shifting back to 3rd then back to 4th. I have a code for the cat efficiency bank 1. But i dont think that will cause it to rev like that only in 4th. anyone else have a problem like this or heard of it?
  2. GM Customer Service

    GM Customer Service Epic Member 5+ Years 500 Posts

    I would be happy to look into this for you with the last eight of your VIN. Please feel free to contact me privately. Thank you.

    Tricia, GM Customer Service.

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