Try looking at the lines for obvious problems and taking them off one at a time to see if the engine noise changes. If it does then that line is good. You can also have it smoke tested where they introduce a smoke into the system to find the leak.
probably vacuum leak.
Check for a vacuum leak.
vacuum leakTo
You can find a small vacuum leak in your 2002 Toyota Camry with a diagnostic tester. The diagnostic tester can pinpoint virtually any vacuum leak.
To find a vacuum leak. the vacuum hoses should be sprayed while the engine is running. A solution of dish soap and water sprayed on a leaky vacuum hose will cause it to blow soap bubbles. Spraying both the hose and the connectors should find the vacuum leak quickly.
how to find a vacume leak on a1999 cougar
I am having a stalling problem and I heard it can be the cause of a vacuum leak and if that is true how can i fix it and where is it at?
A vacuum leak on a 1999 Ford Ranger can be located using an automotive stethoscope. It can then be move around the engine to detect the sucking noise of a leak.
with your mouth
brake leakage? or vacuum assisted vacuum leak?
Start with a visual, inspect all vacuum lines for problems.
If the plugs, plug wires, are good then suspect a vacuum leak somewhere.