My '89 Saab 900 turbo has an intermittent starting problem, somtimes when I turn the key I can hear the starter click, but nothing else happens. Sometimes all I have to do is leave my car alone for 10 minutes and come back and it starts right up. Other times my car will leave me stranded for hours, if I let it, but push starting almost always works. It seems to happen more often in warm weather, in the middle of the day. Any ideas or suggestions would be greatly appreciated.