{"nhtsa_id":602978,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-01-22","date":"1998-11-01","document_id":"866506","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:GASOLINE","mfr_system":null,"summary":"SOME VEHICLES MAY EXPERIENCE ENGINE IDLE SHAKE IN DRIVE, PARK, OR NEUTRAL. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/602978","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_gmc_sierra"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}