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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

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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.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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