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Message: <blockquote data-quote="98GTAZ" data-source="post: 1511527" data-attributes="member: 29480">Checked the fuel pressure. It read 30 PSI which is the low end for the range for a 1998 with a return fuel system like mine. 30-40 is apparently normal per Haynes, and mine consistently read at 30 PSI. Held pressure after turning off car for longer than the five minutes Haynes said it should.I went ahead and replaced the purge sensor, valve/solenoid, and all the lines between each component and the line down to the canister. That seemed to help quite a bit. STFT B1 was in the normal range at -1.6% to +2.3% and STFT B2 was at -2.3% to +2.3%.That held for a day or two, but now the car is running rich. STFT B1 is constantly -6.3% to 0% and STFT B2 is -3.1% to +2.3%. It seems to mainly be running rich on B1, but B2 can sometimes dip to -6.3% before returning to a more normal range.I am stumped. Not sure why it would run lean, than run rich. My code reader can read the extended Ford specific data stream and it reports that all of the heated oxygen sensors still read lean despite the rich condition on B1 from the OBD2 data.Any suggestions are appreciated as this issue is driving me crazy!</blockquote>