As i am Driving my Stealth my RPM is going higher and Im not gaining enough speed as I should be. Also there is a loud huming noise which I know is the trans, but after getting a flush its still humming. The car shift from first, to second, and then right to third, with no hesitation going into the third gear can't tell if the car shifted into the fourth gear or not. Whats going on how should I repair it should I just get a new filter or what.