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Engine not idling properly?

Tiny
EMILYMCKIBBIN
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 2WD
  • MANUAL
  • 298,000 MILES
My car listed above does not idle very well. I have had the throttle body replaced and it helped enough that it sometimes idles when it is not moving but it will not stay running when going down the road and you take it out of gear to stop at a stop sign or slow down for a turn. If you lightly out your foot on the accelerator pedal it will stay running but as soon as you take your foot of it stalls out. Not sure what I should look for next. Thank you in advance for your help.
Emily
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Thursday, August 31st, 2023 AT 3:14 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi Emily, the first thing I would check for is an engine vacuum leak. That can cause a stalling issue and rough idle.

Here is a link that explains how to check:

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

Also, let me know if the check engine light stays on while the engine is running and if you have scanned to computer for diagnostic trouble codes.

Take care,

Joe
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Thursday, August 31st, 2023 AT 8:45 PM

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