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Old 09-16-2012, 09:09 AM   #8 (permalink)
nemo
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Join Date: Nov 2010
Location: US
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Chief - '06 Pontiac Grand Prix
90 day: 26.7 mpg (US)

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The gas gauge and tach have me thinking electrical. Check all connections going to fuel pump and sending unit (in tank unit?) and ignition system, especially grounds.
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