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Originally Posted by speedy_240sx
THe reason I know it is a vacuum leak is because you can hear the suction over the rumbling of the motor. I have change spark plugs and wires so thy are not the reason for a misfire.
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That's not a good way to know if it's a vacum leak. Get your hand on a vacum gauge and see how it is at idle. Hissing sounds can come from anything.
