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You may notice a decrease in fuel mileage and low and mid range may be off a little. You might also have a bit of a rough idle because of the vacuum leak.Best way to check is put a piece of vacuum line on it and try sucking on the other end with your mouth or a vacuum pump.It should be hard to suck on (no wise cracks) you could remove distributor cap and youll see it move when you suck on it.If you can suck or blow easily through the hose and it doesn't move its ruptured.
 
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