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You ought to be able to check for a good ground at the pump , likely on the brake master cylinder with a DVM or volt meter. You can also check for power and or listen for it running on startup. Do you hear it running too often? Do you still have abs?
Also, if you could please post the make and model of your vehicle, it may help us increase the accuracy of our replies!The Altima intake manifold is very difficult to remove, though Eric makes it look manageable in a video on replacing the intake gasket.
If you got the egr pipe and valve off, you have your problem in hand. The valve gets clogged up and starts to leak or get stuck.
You cant gain easy access to the inside of the manifold, but truck/pathfinder/240sx owners can because they dont have the same clearance issues with the firewall and could easily access these plugs. As an Altima owner, if you want the manifold off, you need to remove it while still attached to the head. Plan on a head gasket, because there’s not enough clearance between the fire wall and the engine to get it past the intake manifold studs.
Given this level of difficulty, I’d try cleaning up the valve and egr pipe and testing the back pressure transducer (keeps the egr from opening when it’s not supposed to and looks a lot like the inverted saucer egr valve) as well as the egr solenoid mounted on the passenger end of the hard vacuum lines that run ontop of the intake manifold.