Hello and welcome to 2carpros today we will show you how to find a vacuum leak under the hood of your car important start with the engine cold and avoid . Vacuum leaks can cause engine performance and emissions problems and the 48l 53l and 60l v8 engines are no strangers to vacuum leaks so if youre currently trying to diagnose an engine performance or emission problems that may be caused by a vacuum leak then this the tutorial you need. How do i check if i have a vacuum leak on my 98 chevy 1500 57 l update it idling fine and seems smooth it just acts like im flooding it or something first find out what the vacuum should be then un hook one of the vacuum lines plug in a vacuum pressure gauge and it should match 0 0. In this video i go over all the different symptoms and things you can use to find vacuum leaks on your car a vacuum leak can cause a rough low or high idli. To find a vacuum leak start your car and listen for a hissing sound which may indicate a leak in your engine hoses additionally look for hoses that are shredded cracked or detached since these can be the source of your leak you should also check for any loose hose clamps