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What should the idle be set for a 1999 Chevy Tahoe?

The exact idle RPM for a 1999 Chevy Tahoe depends on the engine size (4.8L, 5.7L) and whether it has automatic or manual transmission, and even possibly the specific options installed in the vehicle. There's no single "correct" number.

However, a general range for a properly warmed-up engine is 650-850 RPM. This is just a guideline.

To find the precise specification:

1. Consult your owner's manual: This is the best source. It will list the correct idle speed for your specific Tahoe.

2. Check a reliable repair manual: A Haynes or Chilton manual for your year and model will specify the correct idle RPM.

3. Consult a professional mechanic: A qualified mechanic can diagnose and adjust your idle speed properly using a scan tool to confirm whether your vehicle is running at the correct settings.

Do not attempt to adjust the idle yourself unless you are experienced. Incorrect idle adjustment can harm your engine or affect other systems. Always defer to the owner's manual or a qualified mechanic if you have concerns about your Tahoe's idle.

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