1996 mercury mystique 2.0 auto: coding P0171 system running lean, bank 1

jayne a

New member
replaced many parts .? I have replaced intake gasket,throttle positioning sensor,throttle body,cam sensor,fuel pressure regulator,idle air control valve,and front 02 sensor. Have also checked entire engine for vacuum leaks and wiring continuity.
these are good. what could it be. is it a common problem with this car?
 
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