car starts and runs, sounds good. when i drive the car it goes into gear fine and the tires roll, then when i get up to like 20 mph the car doesnt wanna go faster, the engine revs up and everything but the car just stays going the same speed. ill take it out of first and put it in second and works until like 25 mph then it wont go any faster in 3rd 4th or 5th. is this the transmission? or the flywheel? idk what the problem is.. cuz its not like its slipping, the car takes off.