RPMs dipping from a complete stop and only in drive?

2000 HYUNDAI ELANTRA
117,150 MILES • 3.8L • 4 CYL • 2WD • AUTOMATIC
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ETERNITYROSE
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  • 1 POST
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.
Aug 30, 2022 at 2:23 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,267 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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Aug 30, 2022 at 10:38 AM
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