2011 is stuttering and has rough idle

[Hkaiser83]

My 2011 just started stuttering and idling rough. The first thing I did was clean out the air filter and MAF sensor. Since that I've reloaded the tune and put new gas in it. It has kooks longtubes, kooks catted x pipe, magnaflow catback, pulleys, intake, and throttle body.

Pretty good stutter and it idles like it has cams. Just reached 10,000 miles.

What should I check?

 

[Van@RevanRacing]

My 2011 just started stuttering and idling rough. The first thing I did was clean out the air filter and MAF sensor. Since that I've reloaded the tune and put new gas in it. It has kooks longtubes, kooks catted x pipe, magnaflow catback, pulleys, intake, and throttle body.

Pretty good stutter and it idles like it has cams. Just reached 10,000 miles.

What should I check?

Change your plugs

 

[Hkaiser83]

Change your plugs

Will do, any recommendations?

Also, are the Weapon X coils worth buying?

 

[zporta]

No, stock coils are all that is needed

 

[Van@RevanRacing]

Will do, any recommendations?

Also, are the Weapon X coils worth buying?

NGK TR6 Plugs Gapped at .030

Your stock coil packs are fine. I went 220 MPH at the Texas Mile with stock coil packs.

 

[gearhead08]

My 2011 just started stuttering and idling rough. The first thing I did was clean out the air filter and MAF sensor. Since that I've reloaded the tune and put new gas in it. It has kooks longtubes, kooks catted x pipe, magnaflow catback, pulleys, intake, and throttle body.

Pretty good stutter and it idles like it has cams. Just reached 10,000 miles.

What should I check?

Early christmas present from santa, custom cam swap without you noticing? But in all seriousness I hope you get it worked out. Never any fun with a 40+k car isnt working right.

 

[NametoShowOther]

depending on the gasoline - change the fuel filter

 

[Hkaiser83]

depending on the gasoline - change the fuel filter

That's next on the list. Going in to get that changed out today.

Changing the spark plugs didnt help but I'm glad I did.

I sat with the car for a bit and let it idle while I checked some numbers on the SCT and once it fully warmed up it smoothed back out and ran like a top. So maybe it's just a rough warm up. Also, it does just fine even when warming up right after starting it. After 30-60 seconds it goes back to stuttering.

Any ideas?

 

[2011 gtcs]

Try putting your stock throttle body back on. See if that changes anything

 

[Hkaiser83]

Well after having the fuel filter changed out the problem has gone away. Thanks for all the ideas!

 

[91svtbird]

Well after having the fuel filter changed out the problem has gone away. Thanks for all the ideas!

We've seen that a couple of times now. Glad you found the problem.

 

[me32]

Seems to be that the issue with the fuel filter is the same on both 03-04 cobras an the gt500. Should be a yearly thing to change.

 

[Hkaiser83]

Is there a way around this fuel filter problem or do we just have to routinely change it out? I don't mind one bit, it's cheap enough. I am just OCD about inherent issues...

 

[GT500RedStripe]

I change mine every year or 5k miles. Cheap insurance.

 

[heatsoaked12]

Well I guess it's better than a filter that lets dirt and debris by. I'm at 4500kms and will change mine out as i noticed a hesitation (slight bucking)on the freeway at around 3500 rpm.

 

[slowbra1]

change your plugs

+1

 

[Hkaiser83]

Ended up being one of the front O2 sensors. We re-routed the factory harness on one side to get rid of one of the extensions. Before I could remember we replaced the other O2 sensor with the GT500 sensor rather than the Raptor. Next month I will replace the one with the Raptor O2 sensor. Then I won't have any extensions.

Just an FYI incase any of you run into this.