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Granted, it is a little hard to tell from this distance, but here are a couple things to check:

1. Test the EGR vacuum while reving the engine. You shouldn't have vacuum at idle, and you will only get a few inches, momentarily, when you rev it up. If that vacuum check is OK, then try removing valve itself and cleaning with a wire brush. Second suspect on that "32" code would be the EVP sensor (the sensor that mounts to the EGR valve and tells the eec what position the valve is in at any given time).

2. You have two sources of stored vacuum that you can check for that "hiss." One is the little round plastic ball with a vacuum hose on it, that supplys your HVAC controls. The other is the brake vacuum booster. The plastic HVAC ball sometimes gets cracked and leaks, and the vacuum check valve may be leaking on the brake booster. Good luck.
 
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