Slow Motion choppy

I've tried to slow down a clip in FCP, and also did a trick with Compressor that's talked about in another discussion on here, and with both attempts, I'm ending up with choppy slow motion. What it's doing is holding on each frame for a period of time (depending on how much it's slowed down), instead of flowing smoothly between the frames and giving a nice slow-mo effect. Rather, it looks like a render job or something, frame by frame, da-da-da-da....and on.
Does anyone have any idea as to why it'd be acting like this? The sequence is set to 29.97 - the footage was captured from a DVcam, firewire, 29.97.
I got the tape from another person who filmed it - there's a chance that it was shot in 24p - could that be the problem? I took the tape and put it in my Sony Handycam to capture the footage. (I think the camera used to record was a Canon - a nicer, higher-end one, but not quite sure if it was 24p).
Thanks for any help.
Brian,.
Quad-core 2.5 G5 Mac OS X (10.4.3) 30" Apple Cinema Display

I found out that the footage was shot at 24p with a Panasonic AG-DVX100. I was given the tape and captured it with my Sony HandyCam via firewire (hopefully that doesn't cause any problems - so far it looks good when playing back at normal speed).
As far as higher frame rate goes, I am used to doing slo-mo in FCP with footage that I shoot with my Sony cam - at 29.97, and it doesn't behave like this.
When I do the Compressor trick, it looks very similar to slowing it down in FCP, maybe just a little cleaner, but the timing and "pausing on frames" is the same.
If I understand you correctly, I don't believe it was "pre-processed" by de-interlacing, unless that would occur in the way I made the quicktime or something (but I doubt it - I did it as you explained).
Thanks for all the help.
Brian,.
Quad-core 2.5 G5 Mac OS X (10.4.3) 30" Apple Cinema Display

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