2014 GT stumble at idle - should I be concerned? - Ford Mustang Forum
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post #1 of 6 (permalink) Old 01-18-2016 Thread Starter
TheJMan48's Avatar
Joined: Apr 2014
Location: Anthem, AZ
Posts: 41
2014 GT stumble at idle - should I be concerned?

I've got a 2014 GT with about 22K miles on it that for awhile now has had a stumble at idle that is most noticeable when the engine is warm. It hasn't set off the CEL, the throttle response is still good and the car otherwise drives normally. It doesn't sound like a traditional misfire where you can audibly hear a pop and feel the car shake, it's more of a "pfft" sound.

Is this something that I should be concerned about? I've run a can of Techron fuel system cleaner but it didn't change anything. Car is stock aside from Roush axleback and Pypes after-cat X-pipe.

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post #2 of 6 (permalink) Old 01-18-2016
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5.0 Coyote's Avatar
Joined: Oct 2010
Location: San Carlos Park
Posts: 2,330
If that was my Mustang,I would have it checked out,it is not running like it should.

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post #3 of 6 (permalink) Old 01-25-2016
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Joined: Nov 2007
Location: Valdosta
Posts: 5,089
Pull the plugs and see how they look. I had a slight stumble and changed the plugs. No more stumble. Mine has 28K miles.

2014 Mustang GT, A6, Grabber Blue
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post #4 of 6 (permalink) Old 01-26-2016 Thread Starter
TheJMan48's Avatar
Joined: Apr 2014
Location: Anthem, AZ
Posts: 41
I actually parked the car today for a few hours on an angle facing slightly downward and when I started the car it seemed to be misfiring/stumbling much more than normal. However, once I started rolling it seemed to clear itself and drove normally. Still doesn't trip the check engine light, and under load is perfectly normal. I'll pull the plugs and see what they look like.
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post #5 of 6 (permalink) Old 01-26-2016
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Location: Martinsburg
Posts: 419
My off idle stumble was caused by a dirty throttle body. As soon as I removed and cleaned it it ran like new.

2014 Sterling gray GT 6M
Paxton Novi 2200 with torque booser and Lund tune, DW1000 injectors, JMS BAP, ATI damper
Lethal ORP, MGW shifter, BMR upper and lowers, Spicer 1 piece DS, Ram Single disk clutch with aluminum flywheel, Power leather seat conversion. Staggered wheels.
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post #6 of 6 (permalink) Old 01-26-2016
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Location: Los Angeles
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Check the coil over plugs as well as the spark plugs. That was my problem

2001 Mustang GT - Crashed (Other person's fault) Stock.
2003 Mustang GT - Sold
Lowered, Flowmaster catbacks, CAI + Tune, 5% tint all around, American racing wheels.
2005 Mustang GT - Traded in
"Performance" spark plugs and ignition coils, 5% tint on back 3 - 20% on front two, 20 inch silver AMR wheels
2011 Mustang GT - BEAST
5% tint all around. 2014 GT premium wheels. Roush axleback
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