2000 Nissan Maxima Intermittent Ignition Error

I have a service code for the ignition error in #1 that is an intermittent problem. I have tried swithing plugs and coils around but it continues to error on #1. Also only has the problem maybe once out of a dozen starts where it will idle rough. Occasionally if you turn back off wait a few seconds and restart it is gone again. Might this be a connection problem in a harness or is computer going bad?