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onto the actual subject regarding the EGR !!!
you can see if the egr is bad once it is out.
look in the opening of egr and you should see a piece of carbon (black rocklike thing) stuck between the opening of valve and seat.
pick it out w/ a pik or screwdriver and reinstall. problem should be gone. but i do suggeest to replace cause once it happens it will happen again.
you also can pull vacuum on the hose by sucking on it to see if the valve/diafram opens to check it
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