Need help after flooring my evo 9 once i let off the rpm still goes up about 300rpm. What gives?

hey guys if there is any1 in the dmv area and have been thinking about getting there windows tinted look no farthure. i have a new window tint shop i just opened. i use the best meterals on todays market and have the lowest prices in town. so what are you waiting for get yourcar tinted today. any car $130