i was adding oil to my bird the other day and i left the car running for a lil bit (2mins) just to let the oil circulate a bit, well i walked back to shut the car off and i could hear a loud hissing sound.... i thought it was a vaccum leak i check all over and i pinpointed it was coming from the rear of the engine. to put it in eaiser words the sound is coming from the middle of the firewall. i couldnt hear it when i was standing in front of the car. only when i went to shut it off. so pretty much behind the engine. one of my fellows at work suggested it was the snorkel. is there a diagram on the net to where i can find where the snorkel is?? thanks. he said if i leave this untouched i can ruin my engine.