1979-1993 & 94 Conv [Subscribe to Daily Digest] |
I had the same problem. The hiss turned out to be a hardend rubber gromet. The gromet attached the vacume lines to the intake manifold and hissed as the boost increased. I replaced the gromet hooked up the vacume lines and got rid off the hiss. The hiss was about to drive me nuts!
posted by 198.81.2...
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