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I have a 2001 Infiniti QX4 that has had some problems and multiple codes read... on 2001 Infiniti QX4

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The main problem is lack of power and at one time it wold stall at a stop....Now it will not pass 3000rpm while driving. Recently had the Transmission flushed and did not help the problem. The codes i have been researching are: P0733, P1140, P0731, P0171, P0174...so far i have narrowed the codes to the mass air flow sensor, O2 sensor and could use some help with the others. Any help would be appreciated....
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po171 and po174 are lean bank 1 and 2 poss vac leak or mass air flow po731 and po733 are trans control module issues and p1140 is intake valve adv i rec having it ck'd by a pro these can be tricky
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