I recently purchased this grand prix and am having a problem with it shutting off randomly while city driving every 50-80 miles. So far I have bypassed the fuel pump resistor by bending over the prong on the relay, changed the fuel filter, and today changed the fuel pump with an OEM. 3 miles after installing the fuel pump it died again. There are no engine lights or codes in the computer and I dont really know where to go next. Other than that it runs great. Any help would be appreciated.