You may have a vacuum leak. Check to see if you need to replace the gasket between the intake manifold and the head. With the engine running, spray short bursts of starter fluid at points around the head/manifold gasket. If the engine starts running much better when you hit one of those spots you probably have a vacuum leak there. Be very careful with starter fluid. It is extremely flamable and if you don't use very short bursts you can cause a fire. If you don't have a vacuum leak, check to see if the injector(s) have anything in them.
Do you mean the EGR (exhaust gas recirculation) system? If so the EGR valve is located on the backside of the cylinder head under the hood cowl. Common EGR symptoms are rough idling,stalling at idle, rough engine performance during light throttle application, and stalling during deceleration. Hope this helps
Hmm... it could be several factors. Is the Check engine light on? If so, see if it points to your fast idle control valve or air intake valve. Either one may be the cause of the high idle, especially if the idle is rough. The leak in the valve cover gasket could be as simple as replacing the cover gasket, unfortunately, it is difficult to assess the machine over the internet.
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