Hello all. I am new to the forum. I have just purchased a 1977 Marathon EZGO with a Robin EC25DS 244cc motor. I am new to golf carts, but I am pretty mechanically inclined. Anyway, the cart runs great at full speed. In fact, it's probably one of the fastest carts I have ever been on. The problem lies in when I try and run slower than full speed. The cart surges and I find myself tapping the pedal. It will not run smooth at lower speeds at all. Could this just be a carburetor adjustment, or is there something I don't know about these things? I would appreciate any help anyone could give me. Thank you.