Got P0171 and P0174 codes

[Chevyguy]

Those are for Lean condition bank 1 and 2 Cleared the codes and they did not come back.

Quick search gives some causes, dirty MAF top listed

http://www.aa1car.com/library/ford_lean_codes.htm

OK I have the tamper proof bits, and electrical cleaner so I go at it. Did not SEE any crud but sprayed it good.

Put it back together fired right up... Duh the MAF is not plugged in.. Plug it in and it stalls.

Fire back up no problems no light or codes.

Driving to Thanksgiving notice it's more responsive and idles smoother, shifts better..

This AM disconnect the battery for 10 min to purge out all the old data and fire it back up. Runs MUCH nicer now and no more wonky shifting. That MAF must have been dirty and caused the lean condition and other drivability Idle issues.

60K miles probably never been cleaned before DO IT

[RF Overlord]

Did not SEE any crud but sprayed it good.
Driving to Thanksgiving notice it's more responsive and idles smoother, shifts better..
Runs MUCH nicer now and no more wonky shifting. That MAF must have been dirty and caused the lean condition and other drivability Idle issues.

The part of the MAF that was causing your codes and driveability issues was the hot-wire sensor. It's very thin and not easy to see anything unless you use a magnifier. It may look clean to the naked eye, but it's not.

(I figure I'll beat Casey to it: "Uh-huh-huh...you said 'naked'..." )

60K miles probably never been cleaned before DO IT

+1

[RoyLPita]

Check the PCV tube where it goes into the intake manifold. I have heard of the same codes come up for a hole in the hose.

[Chevyguy]

Any vac leaks can cause lean codes too. I had not done the sweep with the propane torch trick (not lit of course) but first inspection finds all the hoses looking good.