On again/off again service engine

98 SL2 with 67,ish on her. The service engine soon light will come on every now and then (sometimes triggered by activating cruise control), stay on for awhile, then shut itself off. The colder it is the more likely it is to turn itself on when starting the car in the morning. It probably is only only 10-20% of the time.

I took her to an AutoZone and had the diag machine hooked up. The two codes were "EGR out of range" and something about the "CAM system". Could somebody please explain what these mean?

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