Here in Minnesota we know all about rust.
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I pushed the diaphram on the EGR and it bogged the engine so I am to assume its working?
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That is just the first test.
Now we know the EGR passages are not plugged is carbon.
If you have a hand vacuum pump, apply vacuum to the EGR valve with the engine off and see if the diaphragm lifts and holds open. Then start the engine and see if the valve closes.