It sounds like you may have an air leak between the MAF and the Throttle body. On the factory inlet tube, there are is a plastic tube and a rubber hose that attach to the main inlet tube. Check to make sure everything is attached.
The plastic tube came loose on my 2000 GT and it did the same thing that you are describing.
Or you all stock or do you have an aftermarket Tbody, MAF, or a cold air kit?
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