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2008
chevrolet silverado20 views

Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2008 chevrolet silverado Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

1
medium$150-$300
Replace faulty spark plugs and ignition coils to address multiple cylinder misfires.
Source: https://www.justanswer.com/chevy/gbjdk-2008-chevy-silverado-running-rough-multiple-cylinder.html

Repair Steps:

  1. Inspect and identify faulty spark plugs and ignition coils.
  2. Purchase replacement spark plugs and ignition coils.
  3. Remove the old spark plugs and coils, and install the new components.
  4. Test the vehicle to ensure the misfire issue is resolved.
2
easy$20-$50
Clean fuel injectors and use a fuel system cleaner to improve fuel delivery and reduce rough idle.
Source: https://www.silveradosierra.com/threads/help-2008-silverado-idles-runs-rough-no-codes.16858/

Repair Steps:

  1. Purchase a high-quality fuel system cleaner.
  2. Add the cleaner to a full tank of gasoline.
  3. Drive the vehicle to allow the cleaner to circulate through the fuel system.
  4. Monitor for improvements in engine performance and idle smoothness.
3
medium$50-$200
Inspect and repair any vacuum leaks in the intake manifold or hoses.
Source: https://chevroletforum.com/forum/2007-2013-gmt900-109/need-help-i-have-08-silverado-1500-idles-rough-96432/

Repair Steps:

  1. Visually inspect all vacuum hoses and the intake manifold for signs of wear or damage.
  2. Use a smoke machine or spray soapy water to detect leaks.
  3. Replace or repair any damaged hoses or seals.
  4. Re-test the vehicle to ensure the rough idle issue is resolved.
4
medium$100-$200
Replace pre-cat O2 sensors to correct fuel trim issues causing misfires.
Source: https://www.facebook.com/groups/424435671303737/posts/2169591313454822/

Repair Steps:

  1. Identify and purchase the correct pre-cat O2 sensors for the vehicle.
  2. Safely lift the vehicle and locate the O2 sensors before the catalytic converter.
  3. Remove the old sensors and install the new ones.
  4. Clear any diagnostic trouble codes and test drive the vehicle.

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