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Engine eratic and running rich (black smoke) 900

Not all times but Engine runs eratic and rich (black smoke)some times, I've noticed after a fuel fillup it runs the worst, if I keep the level under half of so the problem hardly happens, any ideas what could cause this, i've replaced the oxygen sensor and power pack modules.
1996 964 174K
Thanks

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1996 964 174K, 2000 S70 62K






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New Engine eratic and running rich (black smoke) [900]
posted by  torrec57  on Wed May 9 15:12 CST 2007 >


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