How do you tell the Symptoms of a inlet manifold leak V6?

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Car is difficult to start, and will not idle. Whistling or sucking sound may be heard, One spark plug may be burning incorrectly.

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A stumbling engine, poor idling, possibly having to keep revving it to stop it stalling at idle.

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I t would be much easier if you provided the year and make of the car. also if you were looking to diagnose a coolant leak or vacum leak.

Generaly a vacum leak in the inlet manifold will result in a rough idle in 1 or more cylinders. The best way I have found to diagnose any vacum leak in an engine is to get a small propane cylinder. Any profesional auto tool supplier such as Snap-on or Mac Tools should have in stock a tool that attaches to the cylinder and alows you to have a small amount of propane to come of the hose end. ( this is called a propane wand)

To diagnose start the car and very slowly move the propane wand around the intake manifold and vacum hoses. when you find the laek the engine RPM will increase and smoth out.

PLEASE BE VERY CAREFULL NOT TO HAVE TOO MUCH PROPANE COMMING OUT OF THE WAND AS IT IS FLAMABLE.

If you are unable to purchase or borrow a propane wand you can try very carefully spraying a little carborator cleaner in the area tou think its not as exact but it will give you a general idea of where the leak is.