On certain days the ignition cranks, but won't start. After maybe 10 or 15 minutes and cranking it several times, it starts. The car normally starts continuously in the day I have it running. If it sits over a day or two it usually doesn't start right away. A couple of times it stalled out in traffic, then started minutes later.
The batter, spark plugs and wires are all fine. No one can come up with the source of the problem.