It can't be clutch chatter because that only happens when you slip the clutch. What you have is the classic buzz that no one seems to have figured out. It happens around 3_3.5 I rpm. When you lift off the gas as you go through the rpm around 3k you get a buzz/shake. If you crack the gas open it goes away. Many theories but no definitive cure.
Search and you will find many posts on the subject.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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