I have a 1996 Grand Am, 4-speed automatic. When commuting to work (1.5 hours each way) recently, I noticed that after about an hour of sitting in traffic, the "D" light on my gear shift starts to blink rapidly. It is intermittent, and everything else seems to be working fine.
Any ideas what this means? I called Pontiac, but their first response is to bring it in for diagnistics. At $70/hour for diagnostics, I thought I would try this forum first. Thanks.