Inconsistent Movement on X and Y

Ok, so I've finally got my Prusa i3 built and wired, but now the issue of movement arises. At first, I couldn't get anything to move except the extruder, and that very jerkily. I found that by turning down the speed of the extruder a tad in Repetier host, I could get it to run smoothly. However, the axis motors were not as cooperative. I went through the whole routine of adjusting the trimpots, to no avail. The motors only buzzed and perhaps vibrated a bit when commanded to move. Then, I came across part of a tutorial that involved adjusting the steps per revolution. So I dove into the firmware to see if that might help. I changed it from {80, 80, 3200/0.8, 700} to {40, 40, 2000/0.8, 700}. This gave me movment, but not correctly. The y and x axis moved 5 cm when they should have moved 1, and z continued refusing to move. I fiddled with the numbers for a while before giving up at {43, 46, 1100, 700}. This game me tiny jerks on z, and inconsistent movement on x and y. To elaborate, if I repeatedly told it to move 10 mm in the + direction, the axis would move 10, then 2, then 7, 15, 3, 10, 11, etc. same for both x and y. However, moving -, telling it to move 10 mm at a time would get 20mm, up to 50 mm. I cleaned and then lubricated the rods, as the movement seemed more consistent towards the middle of the range, which helped slightly.
I'm at a bit of a wall here. Thoughts?

What params in config are you changing? Acceleration or Max_acceleration ? or what?
Seems like with the results your reporting maybe the steps_per param could help.
At least your getting movement - you're ahead of me.

You may want to post your problem in the Mendel and Prusa (http://forums.reprap.org/list.php?151) forum.

I'm using sprinter, and The parameter I'm modifiying here is steps per unit.
float axis_steps_per_unit[] = {40, 40, 3000/0.8, 700};
Thanks for the heads up, I'll try that forum.

SOLVED: Turns out my steppers were taking full steps instead of 1/16th steps. Fixed by putting jumpers on the pins under neath the steppers. You'd think that would be in the electronics manual...