Fluctuating, erratic, inconsistent, poor, or no idle.
Step 1. Check for vacuum leaks - There are a few methods for finding or determining if you have a vacuum leak. The first is a audible/visual inspection. Look around the engine bay for unplugged, cracked, or faulty vacuum lines. Large vacuum leaks will "hiss" so you may be able to hear them. Another method for locating a vacuum leak is using starting fluid(some like to use soap and water in a spray bottle). Spray a small amount of starting fluid around possible vacuum leaks(vacuum lines, gaskets, etc), if there is a leak, the starting fluid will makes it's way inside the engine and the idle will 'jump' This is a sure sign of a vacuum leak. Soap and water in a spray bottle will shows signs of a vacuum leak by making small bubbles near the leaking area. If you find a vacuum leak, replace the faulty part.
Step 2. Clean the Idle Air Control(IAC) and the Mass Air Flow Sensor(MAF) - Here are links to the cleaning procedure:
IAC
MAF1
MAF2
Step 3. Set the Timing, Idle and Throttle Position Sensor(TPS) - Here is a link to the procedure for the 2.5L, the process should be similar for the 2.0L:
The proper/accurate way to set timing, idle, tps
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