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Yep, your intake manifold gasket could be leaking.. Another option is to use some propane around the gasket to detect the leak. Use a propane torch, just don't light it. Do this outside and don't smoke..
Current:
2016 Cayman S
Former:
94 968 Cab 6 Spd. Black/Cashmere D1R SC
86.5 928 Garnet Red Metallic