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I think all of the TB's are the same, it should cycle at ignition, and then if you leave it alone (don't touch anything) it should cycle completely again. And if it's not whistling, it's not working. I have used 986, 996 and 997 TB's and they all behave this way in normal operation. You might have a bad TB? I never got to the point of really troubleshooting as it just 'started working' for me.
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