Hey Scotty, im having am issue with my 2000 Honda accord lx. Ive noticed when I start it up it idles pretty close to around 2000rpm. And when im coasting at around 40-50 mph it starts to jump around between 1500 and 2000 rpm. The RPMs do go higher than usual now when i lightly accelerate. Lastly when i put the car in park before shutting it off, it fluctuates pretty hard between 1000 and 2000 RPM. Any idea whats going on or how to fix it?

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try this video and also search for vacuum leaks https://www.youtube.com/watch?v=NWCKvU2FmDc&t=115s