Thread: Help Please
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Old 09-30-2011, 06:06 PM   #3
fielderLS3


 
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Drives: 2016 Mazda6, 2011 Mustang 5.0
Join Date: Mar 2010
Location: Portage, Wisconsin
Posts: 4,049
My father had an EGR valve go bad on a car, and it only affected the idle. I don't think they can route enough exhaust back into the engine to effect it that much under a load.

There are a lot of reasons it could be down on power. Weak fuel pump, bad compression, weak coil/spark (you do have misfires), a plugged up catalytic converter, sensors, etc...
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