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Check ENgine light glows 1997 Olds Cutlass Supreme, 3.1 L motor

(1997 Oldsmobile Cutlass Supreme)
in Peabody, MA on February 16, 2013
My 1997 Olds Cutlass Supreme with 3100 V-6 motor has "Check Engine" light glowing; scan tool read "P0401, EGR insufficient flow". Is it due to intake manifold gaskets leaking, a common problem with that engine? I replaced the EGR valve and light went out for couple days but glowed again. Help.
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