Please do not use carburetor cleaner, or anything flammable to check for vacuum leaks. Think about what you're doing there. Spraying FUEL on an engine powered by FIRE and with high voltage secondary ignition wires. So many ways to cause a fire and burn your car down. I've seen a really nasty engine bay fire cause by it and all we could do was push the car out of the shop and watch it burn because there was no extinguisher and the water hose was not close enough. Water in a spray bottle works just as well and is not dangerous.