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Hey I got a code P071 - system too lean in bank 1 and 2. I changed out all my 02 sensors about a year and a half ago but, I bought my 03' V6 4.0 ltr in Washington and now live in Colorado. Would the Elevation change ( i live at 5,200 ft) effect anything making my truck start running lean or...

thought it was my water pump, replaced that and my thermostat, and still have the same leak. it's leaking alot of fluid (probably a gallon a minute) from above and behind the water pump. by reading posts i'm finding it may be an old freeze plug, lower thermostat housing, intake manifold gasket...