Rough idle and shuts off?

2004 PONTIAC GRAND PRIX
160,000 MILES
Avatar
JUGGALO45
  • MEMBER
  • 88 POSTS
At first no problems. After 10 minutes it will run fine until you slow down then it wants to stall out but not every time. But also, will have a rough idle and if let sit at idle it will shut off. Then it is hard to start again. But will just low idle and rough. Also notice temperature running hot but not into red zone but fans were not coming on. Any ideas?
May 23, 2023 at 3:32 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi,

Oftentimes, a rough idle and stalling is caused by an engine vacuum leak. Have you checked for that as a possibility? If not, here is a link that explains how it's done:

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

Next, is the check engine light staying on while the engine is running? If it is, then I would recommend having the computer scanned for codes. If you don't have a scan tool, most parts stores will do it for you free of charge.

As far as the fans, let's focus first on the idle issues.

Let me know as much as you can. Additionally, take a look through this link and let me know if it helps:

https://www.2carpros.com/articles/stall-at-idle

Take care and let me know what you find.

Joe
May 24, 2023 at 1:41 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle