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Old December 4th, 2006, 09:06 PM   #14
Nuggets
I fix stuff!
 
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Sounds like your mechanic isn't worth a damn. Assuming all sensors are ok I would be suspicious of the catylitic converter or a stuck open EGR valve. The low vacuum that the MAP sensor is seeing is being caused the engine running overly rich, cat plugged, or EGR open when it shouldn't.
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