2000 Pontiac Grand Prix rough idle problem (it feels like it is going to stall)

dmcamens · 08-06-2008, 06:35 PM

Every couple of days my grand prix (year 2000 - 100000+ miles) idle is very rough when almost coming to a stop (like approaching a traffic light or as I am parking). After the incident it is usually fine for the remainder of the trip. When I step on the gas it runs fine - very smooth and powerful. The only problem is when I am slowing down to a stop. It feels almost like it is going to stall. I recently had to get one of the three "coil packs" replaced. I only noticed this idling problem after the new coil pack was installed. Also, two months ago my mechanic told me that the battery terminals had corrosion on them, but I have not changed the battery yet (I plan to do so soon). What could be causing the rough idle and near stall? Do you think it has anything to do with the battery?

**Midnight Tech** · 08-10-2008, 12:35 PM

Is the "check engine" light on? Kinda sounds like a balky idle air motor.

08-06-2008, 06:35 PM	#1 (permalink)
dmcamens Registered User Join Date: Aug 2008 Posts: 1 OS: XP SP2	2000 Pontiac Grand Prix rough idle problem (it feels like it is going to stall) Every couple of days my grand prix (year 2000 - 100000+ miles) idle is very rough when almost coming to a stop (like approaching a traffic light or as I am parking). After the incident it is usually fine for the remainder of the trip. When I step on the gas it runs fine - very smooth and powerful. The only problem is when I am slowing down to a stop. It feels almost like it is going to stall. I recently had to get one of the three "coil packs" replaced. I only noticed this idling problem after the new coil pack was installed. Also, two months ago my mechanic told me that the battery terminals had corrosion on them, but I have not changed the battery yet (I plan to do so soon). What could be causing the rough idle and near stall? Do you think it has anything to do with the battery?

08-10-2008, 12:35 PM	#2 (permalink)
Midnight Tech Admin/Head GreaseMonkey/Igor's alter ego/Grand Exalted PoohBah Join Date: Dec 2001 Location: SC Posts: 2,920 OS: Windows XP Home/Pro SP3/Windows 98SE/Fedora Core 6/RH 7.2 with Autopoint/TAMS II	Re: 2000 Pontiac Grand Prix rough idle problem (it feels like it is going to stall) Is the "check engine" light on? Kinda sounds like a balky idle air motor. __________________ Please post all questions in the appropriate forum. Questions sent by email or PM will not be answered. Sharing my life...with my Imzadi! Interested in Trek gaming? Check out the Dynaverse! Proud supporter of the Carolinas Aviation Museum. If we have helped you in any way, please donate to keep TSF up and running!