2001 Escape V6

The Escape hesitates and runs like crap. I had it checked at Auto Zone and they brought up P0401, EGR. Now It says there is insufficient flow to the EGR system which part is most common for this action? Also it's misfiring at 6, But I pull the plug wire out and tested it on a grounded area and I get spark. What would cause it to misfire still? Thanks.