I have a 96 Mustang GT with 109k on it and am having a problem. Its an auto transmission. Im having trouble getting her to shift from 1st to 2nd gear. I can go up to about 20mph, n then when i hit the gas the rpms shoot up,but the speedometer goes nowhere and the car doesnt shift correctly. Its like im in neutral once I hit 20mph i have to let off the gas for a couple of seconds and the car will then shift, then after I am in second it's fine. Idk what the hell is wrong with it and there is no check engine light on! Help anyone