Earlier today when I started my car, it was stuttering the first few seconds like it wasn't getting enough gas before it seemed to run OK. When I was driving a minute later, the check engine light started flashing and was that way for about 15 seconds.

Had the car checked out and it came up these 2 numbers relating to ignition. Can anyone advise me on procedure to isolate the source of fault?

Grand Prix 2005, NA, no mod.