Re: Escape/Tribute: rough idle, check engine light, stuttering when accelerating
check the air inlet hose between the TB and the engien for cracks, leaks, loose fittings. check fuel pump/filter and fuel pressure as well. check the fuel pressure sensor. Check for a plugged injector. Check for a coil that is not firing which may cause an injector to be shut down..this will pump air through the engine but without fuel or combustion it will cause the o2 sensor to read lean.
You are either getting an air leak, or not enough fuel. It is probably making major changes to fuel trims while under load, which then over-correct at idle which messes up your idle quality. The I4 is funny anyways with the fuel trims, they are not consistent at idle and under load.