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I came up with.......

P1406 - EGR Valve Pintle Position Circuit
 

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Discussion Starter #3
thanks alot . now can any one tell me what that means and where the egr vslve is locasted on my 96 deville
 

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Did anyone get back to you on this issue? I have the same issue. Where was the EGR located? Did you replace it yourself, or have someone do it?

Thanks.

Tommy
 

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You can try cleaning the EGR valve. This will fix about 70% of them. One problem on the Northstar is there is a metal fuel line tab that shares one of the mounting studs. This turns a 15 minute job of removing the EGR into about an hour and a half. If your EGR is sharing the stud go ahead and obtain the large throttle body o-ring gasket. You will find the throttle body has to be removed in order to access the fuel line. The original o-rings swell up and are imposible to reinstal.A leaking EGR will cause a rough idle.
 

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That is a good way to kill 2 birds with one stone. Take off both and clean!!! :)
 
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