Sethro,
Several of us have struggled with the P0401. Mine was failing for about a year and was finally resolved after replacing the VSV for EGR. Others solved the problem by cleaning the EGR modulator. I don't remember anyone that cleared the problem long term by cleaning the EGR valve. I put...
Kurt,
Junk drives a '97 40th when it is running. :D
Junk,
Tips on removing the EGR valve (procedure is in the FSM):
First, remove the EGR modulator hoses. Be sure you know where they go when you're ready to put them back on. No tools required to remove the modulator. Clean per the FSM.
Be very...