Are you sure it wasn't there before the problem started?
It may also be that your plugs are gunked up a bit from the engine having been run with an improper mixture for a while as a result of the vacuum leak.
No, the computer is just combinational logic. It doesn't have any nonvolatile memory at all, thank God.
I'd check for more vacuum leaks... then I'd do it again in six months or when you do your next scheduled maintenance. If there's one rubber part gone, there are more on the way.
--scott