in HD on my Mits wd y57? Some channels look fine, but my ABC channel stotters badly. I'm using Comcast as my provider. Any help would be appreciated.

It could be something on Comcast's end.

Compare the off-air (from an antenna) ABC feed and see if it exhibits the same problem.

Most likely weak cable signal.

If you see it on multiple channels, it's almost certainly the cable signal. If you see it on only ABC, then it may be a problem with that feed.

I get studdering on fox east using my H20 directv. Its the only channnel that does this. My local fox OTA and via directv comes in fine. So I'd suspect somthing on their end.

Although the local Non HD MN channels also look like they are week OTA analog feeds. Which is said they can't get a clean signal. Not a big deal as I just swich to OTA HD anyway...