The first thing to check is for a vacuum leak. Look at all of your hoses on your engine and the large black hose running from your brake booster to your intake manifold.
Listen for any "hissing" sounds and feel the hoses for dry/cracked spots. If you find any, replace them. You could also purchase a stethoscope for about 5-10 bucks. This'll make isolating the noise easier.
Next check your PCV valve and the elbow/hose. Sometimes these things crack as well. Then you should have a MAP sensor connected to your intake manifold. There'll be a hose connected to that also.
If you can't find a vacuum leak, the next thing to do is test your computer sensors. You'll want to check the condition of your MAF first. Then your TPS, CKP, CMP, etc.
Most likely it's just a vacuum leak. But with a car your age, your sensors are bound to fail sooner or later. Good luck!
Sunday, April 25th, 2010 AT 8:41 PM