I changed my egr valve and now the truck runs even worse. I get a po402 code (egr excessive flow detected) code now. The auto parts store (advance auto parts) said the new EGR may have been defective and ordered me another one. Any other suggestions?
NOTE: I do not know the original code than called for the egr valve replacement.
2000 f150....4.2 v6 engine
Thanks in advance!