emc with camtronics more help please

Sorry to keep asking question but emc is killing me. I'm using
stepermod and I can't seem to get emc to move the same amount every
move. Computer is a p150 pro. I get it set up. I know my x axis
needs 4000 steps to go an inch. I run emc. I move .001 it
moves .001. I do it x times it works x times. I do it once more and
it may not move or it moves .003 It may move .1 three time in a row
with no error and on the forth time drops anywhere between .001
and .01

I've tried tuning the ini file but it doesn't seem to help. Can
anyone tell me what variable in which section I should be looking
at. I've tuned emc.ini serveral times with all the docs I can find.

Should I use feqmod instead? Will it work with the camtroncs 5amp
controllers?

Thanks in advance for even more help.

ben