2006 gmc sle engine lite on. Changed intake gaskets o2sensor wires plugs sensor at the pipe going to the breather box. I forgot the name.
Truck idles rough p0171 p0174 lean on both banks. It is need to know what will fix it. I
have changed a lot of sensors. Changed intake gaskets.
Since you changed the intake gaskets I'd start there. Look for damaged or misrouted vacuum hoses. Also check your exhaust system for leaks and damage. If fresh air is being pulled past the O2 sensor(s) this will indicate a false lean condition. Check the exhaust manifold (s) as well for cracks or bad gaskets. HTH. -Jim
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