RPM's go higher than normal then balance out

2012 HONDA CIVIC
82,000 MILES • 4WD • AUTOMATIC
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MELISSA DODSON
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  • 3 POSTS
I added Gum Out octane booster few weeks later I noticed my rpm's started acting weird. when I go to stop they go down normal towards the one then jump up then back, same as when I'm driving faster the rpm's will go higher than normal then balance out. I'm a single mom and don't know a trusted mechanic in my area and don't want to pay for more than needed.
Feb 28, 2019 at 9:58 PM
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SCGRANTURISMO
  • CAR REPAIR CONTRIBUTOR
  • 4,897 POSTS
Hello,

This sounds like you might have a vacuum leak. Is there any way you could take a video of what's going on and upload to us? This would help us confirm a definitive answer to what's going on.

Thanks,
Alex
2CarPros
Mar 1, 2019 at 1:59 AM
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MELISSA DODSON
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Thank you so much. I will try to send a video.
Mar 1, 2019 at 8:43 AM
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STRAILER
  • CAR REPAIR CONTRIBUTOR
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Hello,

If I can jump in here is sounds like you need to service the throttle bore. Leave the bore wiring connected while you do the service. Here is a guide to help:

https://www.2carpros.com/articles/throttle-actuator-service

This guide can help as well:

https://www.2carpros.com/articles/engine-idles-too-high

Please run down these guides and report back.
Mar 4, 2019 at 11:03 AM
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MELISSA DODSON
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Thank you.
Mar 4, 2019 at 3:52 PM
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STRAILER
  • CAR REPAIR CONTRIBUTOR
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Please let us know what happens :)
Mar 5, 2019 at 9:51 AM