Toyota Repair Problems? Ask a Mechanic for Answers ASAP
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This is a pretty common issue on this engine.
On the bottom of your throttle body you have a part called the idle control valve, this is what the computer uses to set/adjust/maintain engine idle speed when you do not have your foot on the gas. Over time this valve carbons up and jams. Cleaning it out sometimes resolves the issue but usually the only solution on this part is to replace the valve.