That's happened to me before. Is it when you put both the clutch and the brake pedal in at the same time? I got a tune from Bama a couple months ago and that seemed to have fixed it. I can't be sure but I think it was linked to my cold air intake somehow.
Sold - Black 2000 Mustang GT, gone but definitely not forgotten
- Silver 2007 Corvette
Current - DHG 2001 Bullitt