Chevrolet Workshop Service and Repair Manuals > R 10 P/U 2WD V8-454 7.4L (1987) > Powertrain Management | Tune-up and Engine Performance Checks | Idle Speed | System Information | Technical Service Bulletins | All Other Service Bulletins for Idle Speed:

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Add one additional 3/16" hole to plastic bracket and two 1/8" holes in Air Cleaner proper location using revised bracket as hole template

Chevrolet Workshop Service and Repair Manuals