on my 300e it takes a while before i can gain speed ,from a dead stop it take a couple of minutes to get up to 40 mph,and i can not press the pedal to the floor or i will loose speed. While on an incline what ever speed i am traveliing at slowly decreases.I can sometimes pump it and gain speed quicker,however it does not go over 75 mph.Any suggestions that I may be able to check and repair?