Downshifts hard only once and when cold
Have an issue where when I start my truck cold, let it idle and warm up for a bit and then lightly take off. I will be driving the down the street getting up to 50-60km/h when it will downshift hard and rev very high for a second and then straightens itself out. Only does it once and it only does it when cold (and by cold I mean 8C* outside).
Truck is a stock '05 with SCT Looney tune for stock bolts. Just started doing this last week and I have driven with the tune for months now and don't beat on it.