Sounds like yours was like mine at first. If you stayed in the throttle you'd have to let off for the trans to shift. I tried adjusting the cable a couple different ways, looser, tighter, etc. and it didnt really seem to make a difference until I put a really light return spring on the lever on the trans. The lever had so little resistance until halfway through its travel that sometimes it would just sit wherever it wanted to. A small return spring and tightening the cable with the accelerator pedal floored got it where i wanted it. Once you get to that point you can adjust the shift points by moving the stopper on the cable forward or back 1/8" or so until it feels right.