Vacuum leak..

[Garageaholic]

When somebody says that you have a vacuum leak., what hoses/lines exactly should you check for?? (M20)

[Mossman]

Everything after the airbox...

Be sure to flex the boot and check for cracks and every line that runs into the intake mani and boot, brake booster, FPR, the sneaky one that plugs up into the bottom of the throttlebody area.

You can also just spray carb cleaner or something else combustible around while the car is idling and if the idle speed changes it means u have a leak that the carb cleaner is being sucked in to.