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rpm changes

  1. A crazy amount of issues

    General
    Hi all, I don't know a lot about cars, and have no clue if I am posting in the right place, but my 03 GMC Envoy is experiencing quite a few issues, and I was wondering if anyone had any input. All the codes I am getting are P0420, P0442, P1345, P0332, P1482. The only drivability issues I...
  2. Rpms rev up during shifting

    OEM Issues
    I have a 2005 Trailblazer LT 4x4 with the 4.2 I6. 158k miles Wife recently noticed (2-3 days ago) that the rpms have been fluctuating higher during shifting. I drove last night and confirmed. 35mph- 2500 starting rpms, shifts and goes up to 3000—3500 for a quick second and then settles back to...
  3. RPM dropping while driving at low speeds

    Introductions
    Hello, I am new to this site but I have an 04 TrailBlazer and when driving at low speeds my RPM drop and my car is at times stalling out. Has anyone had this issue? Does anyone know what may be causing it? This occurs more with the AC on. Thanks
  4. rapidly changing RPM while driving

    General
    Hello everyone -- this is my first post -- so please be patient with me :) We have an 05 Envoy which we have owned for about 5k mi -- has 65k on it now - we are the second owners. service engine soon light is on as of today but have not checked the code -- my husband is the one who actually...
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