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1998 wrangler code P0171 bank one lean jeep is getting 7 mpg black soot on 1998 Jeep Wrangler

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replaced both 02 sensors, coolant sensor, no vac leaks defroster only, been to dealer twice no luck seems to be an emissions problem new cat.
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yes code reader P0171 vehicle is currently at local dealer for third time in two weeks to diagnosis
no one can pin point the problem so I installed a battery switch and every time the check engine light comes on I flip the switch and reset the computer now I average about 15-16mpg the light comes on every 100 or so miles it can be a pain on long trips but to go from 7mpg to 15 it is worth the trouble