Thank you for coming back with codes.
I was good at guessing for the mass air flow sensor :-)
P0171 is your mass air flow sensor.
Remove it and clean it with brake fluid or electronic cleaner , sometime it does the triks.
There could be a vacuum leak downstream of the MAF sensor, or the sensor is just faulty .
if the fuel filter have never been changed, it time to do it.
P1569 , this is a variable tumble control system solenoid valve.it is between the egr valve and egr boost sensor solenoid valve. it may be faulty.
there is also a variable tumble control system vacuum switch. check the ground at the switch and check the switch.
I have send the diagram in your email and it should be clear there.
Tuesday, October 20th, 2009 AT 3:50 PM