Eric,
Either your pulling on the fabric inconsistently, or the weight of the fabric is pulling against the machine. Guide the fabric, but try to avoid pulling sharply to the rear of the machine. A properly adjusted machine will pull the fabric thru smoothly, with minimal guidance. Try laying a few feet of fabric on your lap as it advances thru the machine, as opposed to the machine trying to lift three feet of fabric off the floor.
Check your machine for odd thread pattern settings if so equipped? Some computerized machine have a "pulse" thread pattern, which may have been accidentally turned on.
Check that the feed dogs are clean, and free of lint/fuzz under the stitch plate.
You may need to adjust (increase) presser foot tension to ensure a consistent "grab" on the fabric.
The stitch length is determined by the feed dogs, the toothy section just below the presser foot. Make sure the feed dogs are fully engaged as well. There should be a button/switch which engages/disengages the feed dogs. When disengaged the fabric will not move at all.
With your big small big small length pattern, one of those explanations should work.
Try running a small 12"-18" piece of scrap fabric thru. If the problem is in the size of the amount of fabric its trying to pull on, the sample will run smooth.
Possible the feed dog mechanism is loose, which will require repair
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