A very occasional starting issue

Ever since I bought the Acclaim, it has very, very occasionally been reluctant to start. The symptoms are that you can turn it over for as long as you like, but it never even attempts to fire. If you leave it and come back 20 minutes later then it will usually fire up fine, or if you spray a generous dose of EasyStart into the air cleaner, this will get it going right away.

This has only happened very occasionally, probably no more than half a dozen times in the five years I have owned the car, which makes it difficult to establish any kind of pattern that could