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2008 Silverado stalls when I hit the brakes

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    • May 23, 2023 at 11:55 pm #762393
      lilnug88
      Participant

      I have a 2008 Silverado 2500hd that will only go about 20mph and almost stalls when I hit the brakes I’ve replaced spark plugs and wires. Could it be a brake booster or a iac valve please send me in the right direction to fix it

    • May 24, 2023 at 8:23 am #762402
      WALI4VR
      Participant

      What engine and trans?

    • May 24, 2023 at 8:35 am #762403
      GM Fan
      Participant

      Definitely sounds like a vacuum leak if it only happens when you hit the brakes. I would start by checking any hoses for cracks/leaks, if nothing then the IAC. I know the IAC is pretty common to go out especially at higher miles, if not that then maybe TPS? Does it idle high on cold startups or is it difficult to start when hot?

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