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Can't help you with the codes but my car has hissed too, mostly when it's stumbling around 500 or so rpms. Once it reaches "normal" idle around 750 it won't do it but it will "exhale" when I shut it off, at least now I know where to look for help. As for the Thermactor valves, have you checked the vacuum signal going to the actuating solenoids on the back of the passanger side strut tower? There should be two solenoids back there, one for the EGR and the other actuates the Thermactor valves. If you still need help I can look up the Thermactor test procedures in a manual I have at home. Shoot me an e-mail if you'd like these, they may help.

Carson
 
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