by 
wigglepin
ANSWERS: 3
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You will get poorer gas mileage as your engine will not run as efficiently. Your auto emissions will also increase. A properly operating EGR can theoretically increase the efficiency of gasoline engines via several mechanisms: Reduced throttling losses. The addition of inert exhaust gas into the intake system means that for a given power output, the throttle plate must be opened further, resulting in increased inlet manifold pressure and reduced throttling losses. Reduced heat rejection. Lowered peak combustion temperatures not only reduces NOx formation, it also reduces the loss of thermal energy to combustion chamber surfaces, leaving more available for conversion to mechanical work during the expansion stroke http://www.misterfixit.com/egrvalve.htm
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replace it.
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well then, it sounds like you need to get it fixed! Or replaced! Or possibly you need to unstuck it!!
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