I have 1999 Tacoma with 3.4l Auto trans with idle issue. I have replace Plugs, wires(the three of them), cleaned throttle body, changed air filter, replaced Idle Air Control valve(had trash in it), checked for vacuum leaks,etc. and still cannot get it to idle below 2100-2200 rpms. Truck runs great other than it will not idle down. I got it to idle down to 1100 rpms last Saturday after adjust idle screw and checking for loose vacuuum lines,etc. Two days later idle is back up to 2100-2200 rpms.
Anyone got any ideas where to start with this issue. I've never run into anything quite like this before. Thanks in advance for help.