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Check for vacuum leaks... (archive)
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Posted by JamesM on December 31, 2000 at 07:46:38:

In Reply to: funny noise from engine Help! posted by david on December 30, 2000 at 21:29:32:

Moderate vacuum leaks can sound like a hissing noise. They also cause the engine to stumble and run like crap, especially at idle. It's possible a hose has cracked or something popped off. Check your crankcase breather hoses, as these become very stiff and brittle with age. Also check your brake booster hose and the fitting in the #4 intake runner, the idle control air circuit, and the 4 rubber nipple covers on the throttles.

Adrian suggested to check the exhaust manifold nuts on the engine. If this is the culprit, the noise will be a ticking sound, fairly noisy under the hood.

Good Luck
james
james_535@yahoo.com

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