Are you sure your getting boost I had the same problem on my 99 and 02 the dealer couldn’t figure it out and tried replacing all kinds of stuff. My father was with me and while looking under the hood and the dealer noticed that the vacuum line on the side of the supercharger that connects to the bypass valve was unhooked put it back on and worked ever since. Same thing happened a few years later in the 02 might not be your problem but worth a check. Best of luck
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