07 Mustang Brake Question

I have a 2007 tungsten V-6 convertible and several times this winter have experienced a problem where the engine seems to be idling at a higher than normal speed when I am braking. I have to brake much harder than normal to get the vehicle to stop.
At first, it felt like the mat was on top of the accelerator but recently I adjusted the winter mats by cutting off more of the rubber near the accelerator. The problem still exists randomly.
Has anybody else experienced this and what was the solution. I will have to take the vehicle back for the air bag software fix and appreciate any comments.

Thanks in advance,
Ron
Munroe Falls, Ohio
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