gallindy Posted September 8, 2014 Report Share Posted September 8, 2014 95 deville 4.9 stalls at idle no codes set, ICS replaced - no change. Exhaust system replaced including catalytic converter. Started to remove EGR, discovered that it ran much better WITH a vacuum leak. - the brake booster hose was off. Any suggestions? Thanks Quote Link to comment Share on other sites More sharing options...
KHE Posted September 8, 2014 Report Share Posted September 8, 2014 Did you adjust the new idle speed controller? If not, that may very well be the issue. There is a lot of information in the archives on the ISC for the 4.9 engine. Introducing a vacuum leak had the same effect as opening the throttle. There is probably nothing wrong with the EGR system. Quote Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
barczy01 Posted September 9, 2014 Report Share Posted September 9, 2014 Have you put a new battery in recently? Quote Link to comment Share on other sites More sharing options...
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