Vehicle Compatibility Information For Chevrolet Trailblazer 4.2L 2008-2009 For GMC Envoy 4.2L 2008-2009 For Isuzu Ascender 4.2L 2008 For Saab 9-7x 4.2L 2008-2009 What is a throttle body ? The throttle body is the part of the engine that mixes air with the fuel to allow combustion to take place. When a throttle body gets clogged with carbon, the vehicle may suffer from issues ranging from a lack of fuel mileage, loss in efficiency or may even become totally inoperable. When you need to replace the throttle body: .
