Car Trouble (updated)

[OnlySunshine]

The technician finally looked at my car today and did an engine diagnostic test but was unable to find any error codes.  He was also unable to replicate the symptoms I described.  The only thing he noticed was a minor misfire in the engine but the car still runs.  Due to the idling problem and rough start, I'm having them replace the spark plugs and wires since they haven't been changed in at least a year (probably longer than that).  I had the same problem with my other car of the same make and it fixed the problem.  Please say some prayers that my car runs smoothly after this.  I'll get it back before they close today at 5pm (YAY!) so I hope to make it to school tomorrow.  Thanks for your prayers!