I'm having a bit of a problem with my 91 L coupe Auto.. I have this random clicking sound somewhere in the engine - It doesn't do it all the time or even every time I start the car. I heard after maybe an hour of driving when I stopped at Taco Bell, a couple times in the morning when I started it (but it wasn't cold outside), and one or two other times. I can only hear it at low RPMs - like when it idles or when I rev it in first gear or park. The sound increases in speed as the engine revs up. Has anyone has this problem and can anyone offer me suggestions? Thanks..