I have a 1998 Pontiac Sunfire. Tuesday When i started it it made a grinding sound at start up only and then ran fine, later that night every time i would get in my car to leave(work, grocery store, movie store) it would make that same sound. Wednesday i was trying to go to work and when i moved the key to start, there was only a sound of the fuel injector it wouldnt turn over. I have replaced the starter, the ignition and the relay switch of some kind. I am lost and can not figure it out. Also we can get the car to start by using a screwdriver to cross start it on the starter. Then it runs fine. Can you help?????