I had a similar problem with my supercharged 99 Suburban.. We searched for 3 days and took to 2 shops to find a vaccum leak..Finally Took to friend at dealership ( which one day I will learn to go to 1st).. They changed plugs and wires and has never had a problem since.. My got so bad it would die at the stop lights.. Very embarrassing to have a custom tricked out vec. at the stop and then die!
Good luck .. I'm sure the dealer will be able to fix you up.
Mike
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