I have the same problem. 00 SVT, immediately after replacing fuel pump, I have the chugging in third gear below 2500 rpm. I have seen one or two other posts here with the same symptoms also following the fuel pump change, but so far have not seen any conclusive fix. Many of the posts focus on plugs or wires, but I can't help but think that this has to be related to the new pump design (different than the original.) Any ideas out there?
