Hi all, I'm sorry if this has been aked before (I did a search) but here are my symptoms, I hope someone can help...

'98 contour V6 DOHC 110,000 miles

Getting a code P0402, already replaced the EGR valve last night. I don't know if it fixed the code yet but the problem below is still occuring.

The problem is that when driving (taking off from light) there is a lot of hesitation and a bucking sensation. This "bucking" happens while driving at a constant speed (any speed) and also while idling in park, (the "bucking" is a lot worse when accelerating though)

My question is, could this be related to the EGR system and if so what part is next to replace?

Any help is appreicated! Thanks!!