car runs & drives for awhile then losses power & stalls, replaced throttle postion sensor, had & still has diagnostic code P0171 system too lean bank 1, replaced fuel filter & had black gunk dripping out of it, think could be plugged fuel strainer or plugged fuel regulator screen or failed fuel regulator or plugged fuel return line or leak in vacuum hose to fuel regulator, any ideas?
Could be stuck egr valve, vacuum leak or clogged catalytic converter.
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