You should ensure the idle screw is in where it is actually controlling the idle.
If it is out too far, the idle will creep up.
If the TPS is out of adjustment the idle will creep up.
There are several causes so diagnosing them is step by step process of elimination.
Check the idle screw, vacuum lines and the TPS adjustment, easiest to more difficult.
If you jumper the Diagnosis test like you would when setting the timing, does the engine drop in idle speed?
If not, the TPS is out of adjustment, or needs replacement.
HTH
Danny

Last edited by toyrunner; 01/09/10 08:07 PM.
1985 SR5 4Runner
eLocked with Carter Lock
4.7:1 single case
Davez Offroad twin stick