cleaned all lines (EGR to VSV, EGR to VR, lines to air intake manifold;
ohms tested satisfactory heat sensor at EGR/intake manifold.
Lightly (with qTip) cleaned out intake manifold orifice connecting to EGR.
Next? Replace Vacuum Regulator VG? Replace Vacuum Switching Valve VSV?
Suggested to "scour" w/22 rifle brass cleaning brush intake mainfold orifice?
Tacoma has 220k miles and previous owner was spot on with maintenance!