Okay...deep breaths! Most of these problems can be solved by going through a step by step "checklist". First, try what the last 2 posters have asked you...is this problem in stitch regulated mode or manual, or both?
Are your skipped stitches in one direction or the other, or on curves? Are your tracks and encoders clean?
All of the answers to these questions will help us help you. As long as your machine is running, it can be helped! Deep breaths, then look at it and let us know.