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74, 911 exhaust clamps support

Engine

Vehicle Information: Model: 911, carrera, targa; Year: 1974; Body Type: Targa; Total Mileage: over 100k;

Hi Ed, I just purchased a 74 911 and I have two questions to start with?!!!, A- I have a hard time to start this puppy when she is hot, (mainly after she sits for 20+ minutes), It seems like after cranking for a minute or so with no results, if I lift the air cleaner cover and press up on the bottom of the air sensor plate (with ignition on), I hear a hissing sound and then the engine would fire right up when cranked, (what the h...?). B- this car came with an ss muffler but there are no straps, and no support bracket for them, how significant is supporting this muffler?, THANX

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