When? at idle or all the time? Either way check all your engine vacuum hoses for leaks, disconnections, or cracks. Good Luck!
All the time I can drive around without using the gas petal
Other ideas if this does not pan out is the throttle position sensor or if applicable ruptured EGR diaphragm. If you have a Mity-Vac hand pump you can test to see if EGR holds vacuum. See if there are any stored or pending codes. That's all I have on this one for now.
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