got a 2000 gtp daytona sometimes when i hit the gas the car downshifts which feels like a normal car powering along but a second later the rpm jumps and itll throw you back in your seat, but other times itll downshift without the extra boost of power slightly after the downshift anyone know why sometimes it works and other times it doesnt. it happens at all speeds and gears i need that extra power all everytime i pounce on the gas not just half the time please help