hi
i have the same problem with mine. i just open the windows and sun roof 
sorry i know that's of no help 
both jobs are time consuming below I've attached a link for the procedure on the motor mounts:
928 S4 Service - Motor Mounts
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Porsche 928 S4 1989,Auto, 93K on clock, gun metal grey with cream interior. Coulsdon, Surrey, UK
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