93 cutlass ciera 3300 changed fuel pump and filter now will run fine till it decides to take a break. will not shut down on you but you shut off the moter and then it just wont start sounds like it wont git fuel I cranked on it disconected the battery re conected cant put my finger on whats wrong parts guy keeps telling me its the brain i want a second op.. before dropping another 300 in this junker