Nissian Maxima trouble code P0171 ? What can I do to Find the problem with Bank one too lean?

Question:
Car is running at very rough idle. Some times it runs fine. Over the last two days its getting worse. Reset code Was wondering where would be a good start on trying to fix this problem car has abuot 139000 miles Im trying to help my neibhor she is on fixed income and can not afford to take it to a shop.Ive worked on cars for 10 years and this one has got me stuck. Thank you for your Help.

Answers:

transmission slipping after putting new fluid in?

With that code I would check the intake manifold gasket. It has to be a vaccum leak making the mixture lean out. Get a can of Ether or such and spray it around the intake manifold and see if the motor revs, if it does there is your leak.

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were can i get a workshop manual for my 1997 bmw318ti?

check for a bad plug or wire or if a injector is sticking.or a vacume leak but that usaully sets both codes, check for o2 sensors switching

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schematic diagram for KIA Rio 2001 ignition switch, I am beating my brains out trying to find it. please help?

you have a bad mass air flow sensor i have fixed many of these, also only replace with one from nissan as aftermarket ones are junk,

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