there is a real good chance that it will. Vacuum leaks are really bad for the performance of your truck.

 

The vacuum line I'm thinkin it is, is the one that makes my ac come out through the dash because when I step on the gas it quits coming out of the front vents and starts coming out of the defrost vents. Woul that affect it?

 

lean means your getting too much air. try removing the tbs to see if it goes away. if not switch the 2-1 O2 sensor with the one from the other bank. if the code moves to 1-1 O2 sensor, replace the O2 sensor.

 

Ok thanks ill be able to do all that today if none of that works could it be the vacuum lines?