Idling issues

CHELSEY EDWARDS

MEMBER
1994 GMC TRUCK
4.6L
V6
4WD
AUTOMATIC
305,000 MILES

My truck idles really rough to the point it shakes the whole truck and then shuts off this happens when idling, at low speeds and stops. I have checked sensors and replaced fuel filter not sure what else could be causing this?

Thursday, November 5th, 2020 AT 1:48 PM

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

If this just started happening then the most likely cause is a vacuum leak. Let's run through this guide and go from there.

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

If this does not help then we need to check for codes but I am pretty sure we have a vacuum leak so I would be surprised if that doesn't help point us in the right direction.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let us know what you find. Thanks

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Thursday, November 5th, 2020 AT 2:13 PM

CHELSEY EDWARDS

MEMBER
2 POSTS

Okay, I know I already asked and I haven't checked whether it is a vacuum leak but I just thought I would add a video for reference. I will check for a vacuum leak tomorrow.

Video (Click to make bigger)

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Thursday, November 5th, 2020 AT 6:54 PM

KASEKENNY

MECHANIC
18,907 POSTS

That does help. Thanks. It does point to a vacuum leak as well so clearly that is where we need to start. If you have no check engine light the I doubt it is a misfire but if there are no vacuum leaks that will be the next thing we need to check. If you have not replaced ignition components in a while, that would not be a bad idea to do anyway but clearly start with a vacuum leak as you said. Thanks

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Friday, November 6th, 2020 AT 2:25 PM