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Old 01-16-2011, 06:18 PM   #7 (permalink)
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Join Date: Nov 2010
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Chief - '06 Pontiac Grand Prix
90 day: 19.41 mpg (US)

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I haven't tried a fuel drier, but because of the way the timing light fails to light up sometimes, I'm pretty sure it's something going on in the ignition system (sensor or hard parts) and not an air or fuel issue.
Just an off the wall thought, have you tried the timing light on another vehicle. You said it is new, but if it is flakey it could be sending you off in the wrong direction.

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