Hope they figure it out and fix it for you.
I had mine do this when the TB motor was acting up. Mine wouldn't even run,
had to have a truck pick me up.
So many things it could be.
WindEvil Blue 2005 Mustang GT Premium, Automatic
RKSport Cal Dream RAM Air Hood w/FR Hood Pins, CDC Classic Chin Spoiler, Blue Fog light covers
GT-500 Rear Bumper, Magnetic Blackout Panel between Tail lights, Matte Blk V6 side rocker panel
Anthracite FR-500's 18 x 9's w/ 255/45ZR18 Goodyear Eagle F-1 Front, 275/40 ZR18 Rear
Drilled and slotted rotors, Coast Alum. 1 piece Drive Shaft
Magnaflow Catted X and Magnaflow Axel backs
Saleen Stage II SC Kit with Custom Tune,GT-500 Fuel system, 39lbs injectors, 90mm MAF
448 RWHP 418 TOR