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RPMs dipping from a complete stop and only in drive?

Tiny
ETERNITYROSE
  • MEMBER
  • 2000 HYUNDAI ELANTRA
  • 3.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 117,150 MILES
When you make a complete stop and go to accelerate, she dips like she's going to shut off but goes back to normal and continues, drives fine if I don't stop but that's an issue. She has a check engine light on for a small leak in evap system, but I've fixed all the things that I thought would fix it, IAC valve, fuel filter, fuel pump and spark plugs.
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Tuesday, August 30th, 2022 AT 9:23 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,110 POSTS
This does sound like you have a vacuum leak or the throttle bore needs to be serviced.

Here are two guides that will help you:

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

And this guide, make sure the engine is cold when you do the test:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check out the diagrams (below). Please let us know what happens.
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Tuesday, August 30th, 2022 AT 5:38 PM

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