Per biran:
>I have a 1999 gmc yukon sometimes it feels like the steering goes away for a
>second or two has anyone else had this problem?
>Everything feels tight fluid is good no leak's
>Thanks for the help in advance.
In my '98, there was a sensor somewhere in the system that helped relate
steering effort to vehicle speed.
When it came loose (twice), when it just plain failed (once), and when I lost my
battery due to alternator failure (4 or 5 times...) it stopped doing it's job
and the steering had a feel that might be described as you decribe your problem.

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PeteCresswell