its a 5 speed. it does not do this everytime i drive but from 1st to 2nd at roughly 2000 to 2500 rpm the car sputters and then from 2nd to 3rd same rpm's 4th and 5th do not do it, and as it starts to sputter and you give it gas to go nothing happens you can floor the pedal and its like the car is not on, so i switch to the next gear same thing and so on up to 3rd gear, does anybody know what causes this? thanks in advanced