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Fuel pressure regulator. Mine was running rich, gas millage not up to norm. My Porsche mechanic found the problem quickly. He pulled the vacuum hose off the switch and smelled raw gas. Porsche no longer stocks the part so I bought it from Pelican. Replaced the diaphragm damper too.
Car runs great!!!! What he told me: If the O2 sensor was bad the car would struggle to maintain a constant idle
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Jim
1983 944n/a
2003 Mercedes CLK 500 - totaled. Sanwiched on the Kennedy Expressway
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