# Thought I fixed misfire/stumble remains **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** vue, saturn\ **Created:** [July 10, 2020, 2:55pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082 "2020-07-10T14:55:15Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 10, 2020, 2:55pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/1 "2020-07-10T14:55:15Z")
Misfire on #1 due to old plugs and crack in coil housing. ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [July 10, 2020, 10:41pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/2 "2020-07-10T22:41:29Z")
How did the old plugs look? Try a bottle (or two) of Techron in the gas tank. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 11, 2020, 12:38am UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/3 "2020-07-11T00:38:43Z")
Misfire on #1. Crack in coil. Next step. ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [July 11, 2020, 1:49am UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/4 "2020-07-11T01:49:33Z")
Have you swapped the coil packs? If the misfire doesn’t follow it’s maybe time for a compression test. > [@Cavell](#): > > #1 was worse of bunch. Worst how? Black soot? Deposits? ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 11, 2020, 7:02pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/5 "2020-07-11T19:02:16Z")
Oh, got a new coil pack. Problem is fixed on rear bank for plugs 1-3-5… The #3 coil plastic was cracked at the base of the rubber boot but the #1 plastic looked ok and the misfire was on #1. So, there is that. A crack is not absolute proof there is an issue. But it kinda leans that way. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [July 11, 2020, 7:09pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/6 "2020-07-11T19:09:35Z")
> [@Cavell](#): > > A crack is not absolute proof there is an issue. In my opinion . . . any coil that is physically cracked can’t be trusted ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 11, 2020, 7:11pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/7 "2020-07-11T19:11:35Z")
Image deleted ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 11, 2020, 7:30pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/8 "2020-07-11T19:30:25Z")
Image deleted ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [July 11, 2020, 7:39pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/9 "2020-07-11T19:39:21Z")
I’ll go a little off-topic I’ve seen lots of problems caused by 4-electrode spark plugs Usually in engines that weren’t designed for them ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 11, 2020, 8:37pm UTC](https://community.cartalk.com/t/thought-i-fixed-misfire-stumble-remains/167082/10 "2020-07-11T20:37:41Z")
Vue website said use Bosch+4. Got 8yrs of good service. Put in dbl platinum now. Misfire on #1 is gone. But I got front of motor wet and have misfire on #2. So, I just pulled front coil. Yes it has cracks on 2 of 3 plug bosses. Ok. Life is like that. Replace coils in pairs.