Hi i have a 2001 buick regal gs with a cartuning turbo kit on it. My problem im having is the trans feels like its slipping or something when you floor it in first gear and then as soon as it shifts the car squaks the tires and feels fine and pulls much harder. What could be causing this. Is there anything in the tune i could change? Is there anything i can monitor to tell me what is going on. Thanks.