× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: Intermittent missfire
Posted to Technical Discussion Forum on 12/13/2016

Good engine vacuum is 21" at idle

Map should be .8 to .9v at idle

Low engine vacuum or high MAP voltage could be tight valve adjustment

Ray Login to read more.