Hey everybody. So I was driving earlier tonight and I had my CTS tranny (3.2l) in sport mode and when I did a hard acceleration the car downshifted and when it got to around 4k rpms it just hung up? It felt like the engine brake engaged, but i was into the gas pedal. When I let off the gas and pushed the sport mode button to disengage it, the car drove and shifted fine the rest of the time. It felt like while it was trying to keep the car in a lower gear while in sport mode, it was also kinda in nuetral. Anybody out there with the 2003 lux sport come across this confused confused problem before? Let me know, thanks!