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If the EGR valve sticks open, it dumps exhaust into the intake. The engine runs poorly, bad enough to stall. The standard test for the EGR valve is to let the engine idle, force the valve open manually, and if the engine runs rough and stalls, that shows you don't have a problem... the EGR valve is sealing properly.
The engine will run fine with deleteing the EGR. But if you have a valve that is leaking exhaust into the intake when the PCM isn't expecting the exhaust to be there, it can cause misfires, rough running and poor fuel mileage.
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