My 2003 v8 durango has a vacuum leak how do i find it by myself?

hmm most obd2 vehicles will set a p0174/p0171 fuel system rich or lean a vacuum leak will definitely cause the check eng light to come on due to improper air fuel ratio is the check engine light on ??

If your truck is using oil then it could be the plenum pan gasket that is leaking vacuum. Another symptom of that is detonation as the oil that gets sucked into the leaking plenum(from the lifter valley) finds it's way into the cylinders effectively raising the compression ratio. No quick easy fix of that situation. If it is a leaking vacuum hose or diaphragm, then invest in a hand operated vacuum pump. They're sold at auto parts stores, and are very helpful in diagnosing leaking vacuum diaphragm. They come with instructions to tell you how to use them. Also very useful for bleeding brakes. If you can actually hear the vacuum leak, I'd bet that is where the leak is.

Yep, exactly what he said. Thanks for 2 points!!

The best way and best thing to use is an aresol that sprays a mist like wd-40. Start the car and the leak will suck the mist down where it is.

Spray some WD40 on the lines and fittings. The motor pitch will change when you hit the leak.

Soapy water in a spray bottle and start spraying but don't spray on the electrical components.