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Change the fuel filter also.
Another thing that is worth just changing is the O2 sensor.
A failing dampener or regulator will cause abnormal fuel pressure, only way to check these is to check the pressure at the rail.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
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