2001 Ford Focus EGR Valve?

My car would not start I would have to hold gas in to start it and if I let go it would die when it did this I would only be able to go forty and it would rev pretty high. I got egr replaced and it starts but it hesitates a little and code came back on in a day p0401 and p0402. It still wont start but I hit gas and it starts and stays running now> When I clear code it runs bad like stumbles alot and almost feels like tranny slips but its not. Espically around 40 it stumbles alot. They replaced dpfe sensor in January so they wouldnt replace it again in april but replaced egr. It worked real welll for the foirst 3 days even with code up but then started with the same crap again. Could someone please help my car has been in 3 different shops about 15 times in the last 3 months no one can seem to help me SOME ONE PLEASE HELP IAM GONNA GO BANKRUPT IF THIS PROBLEM KEEPS PRESISTING.