Fixing idle problems on Toyota 4AGE Engine (Fuel Mixture, Dirty Throttle, Vac Leaks, ISC Valve...)

How to trace and solve idle issues on your Toyota 4A-GE Engine (some may work for other Toyota Engines as well!)
Possible causes of wrong idle on your Toyota 4AGE engine can include:
1. Wrong idle adjustment screw tuning (check this video for a how-to on this subject: • Toyota 4AGE : How to s... )
2. Too rich mixture (I show how to adjust the fuel mixture)
3. How to clean the throttle body
4. How to spot a vaccum leak
5. Wrong ignition timing (How to set ignition timing on a 4AGE Engine: • Toyota 4AGE Engine: Ho... )
6. Wrong TPS (Throttle Position Sensor) tuning (See here how to set up your TPS correctly: • Toyota 4AGE : How to a... )
7. Stuck Idle Control Valve (IACV, ISCV or Idle Speed Control Valve).
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