2001 F150 code p0402
 

I have 2001 F150 4.6 with code p0402,replaced EGR valve and DPFE sensor can anyone that has knowledge of that code steer me in the right direction? Causing bad miss at times then sometimes runs great Ford ealership ran a pin point diagnostic test and they said i was DPFE sensor for sure.Gave them 73.00 left and changed DPFE and EGR myself.This problem started about 30 miles after fill up going up Monteagle Mtn.