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  1. General Chevy & GM Tech Questions
    Hey all. I have a 2009 GMC Sierra 1500 (LMG engine, 4L60E trans) with about 175k miles. The past couple times I’ve started it, it seems to idle just fine, but when I put it into gear (no matter if it’s drive or reverse) the RPMs drop significantly, almost to the point of stalling, but they...
  2. Chevy C/K Truck Forum
    There is something strange with my truck... I have changed out the TBI and replaced the gaskets on it. Replaced the TPS and the IAC... Drives better. When the weather was VERY HOT about a week ago, it would almost die when the RPMs would drop. That was before I changed the those two components...
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