Engine Performance problem
2003 GMC Envoy V8 Four Wheel Drive Automatic 81000 miles
I keep getting a P0171 (system too lean) code. I changed the wires, plugs and fuel filter. It idles real rough in the morning. After it warms up and I drive 5-10 miles or so then everything runs fine. Could it be the O2 sensors? The MAF sensor is reading 3.49 on my scanner which I believe is normal.
Saturday, April 1st, 2017 AT 4:51 PM