I own a 2002 century. It currently has a lurching issue when stopped. It also looses power on acceleration and in normal running. Neither parts stores nor mechanics scans pull up codes. Neither of them could tell me why it was lurching. I then called a dealer service department. They told me to change the ignition module and coils. I have done so. Still have same issue. I have even used the rest types suggested. Still not working. Please help. Thank you for any and all help.