what sound does it make when its missing..

if its not firing the sound it makes is a quiet one since the engine wouldnt be running ;) , if its missing then the idle would be lower and be rough AND have a significant loss of power...
 
my engine is idling ruff... and it shakes the hell out of its self. should i replace the spark plugs??? Ive seen atleast 3 inches lost of vacuum.
 
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