Help with stuttering/jittering problem AFTER export

Hi all,
I'll describe the problem, then the solutions I've tried. First, my system is a Dell Precision 690 3.0Ghz dual core, 2Gb ram, win XP pro service pack 3, Premiere CS4. I also updated to the latest nVidia drivers (8 Jan 09, ver 181.20) which fixed a separate crashing problem with CS4.
Here's the problem. My video in the timeline previews perfectly. No jittering, stuttering, or flickering. When I export my video, I always get some scenes jitter or stutter (the action in the scene jumps around back and forth). This generally occurs in the same places of a scene. I don't have any stills or freeze frames.
I've read some of the forum threads on flicker and stutter, but they mainly apply to a frozen frame, or picture. I've played with the following with no effect: anti-flicker, gaussian blur, increasing my bit rate, exporting to different formats (mpeg1, avi, wmv).
My frame rate is 29.97 drop frame. It wouldn't allow me to change my field order. Other settings are NTSC, multiplexer (Mpeg1) (I'm not sure what that does), multiplexer bit rate=variable, video bit rate tried at CBR= 3.0Mbps, and VBR1 (min=1, avg=3,max=4.5).
This is driving me crazy as my timeline preview is perfect. Please help!!!
Thanks very much in advance! Also, is CS3 less problematic than CS4?
RickyRoma

Ricky:
The successful export was based on a time consuming troubleshooting work-around.
This was a corporate video that was played at a fairly large meeting. Several months later other departments of the company wanted to use the same video, but with some shot changes that are relevant to their departments. In the meantime, we upgraded to CS4 and had to open the CS3 project with CS4 (We uninstalled CS3).
I narrowed down the jitter problem to a graduating Gaussian blur added to a PSD on Video layer 1 that had an image above it on Video layer 2 with a transparent background. Gaussian blur and fast blur cause unacceptable image shake when the timeline is rendered and the shaking exists in the exported AVI. Fortunately, I was able to overlay segments of the original CS3 exported avi over the shaking areas in the new CS4 project because those areas were not changed.
The overlay presented yet another minor problem. The aspect ratio of a widescreen NTSC video exported from CS3 is about 8 pixels wider than that exported from CS4. So I had to stretch the old CS3 overlayed avi segments to a place on the timeline where the aspect ratio change was not detectable.
*It is possible that one of the editors stretched the width of the CS3 avi. One person in the forum did confirm though that CS3 exported avi's with a slightly wider aspect ratio than CS4.
We had a few other weird problems with this converted from CS3, CS4 project:
1.) Certain still image transitions failed to work. They would appear normal until rendered. The exported avi would be missing the transitions.
I found a workaround... For whatever reason hitting the "reset" icon in the Effects Control pallet (keyframe added) fixed the missing transition problem.
2.) Some timelapse, scaled down P2 1080i footage on the timeline exported with an odd unintended effect. The sky with clouds would hold a few frames, then jump ahead. Kind of a stop-start effect that was not in the original footage.
Didn't find a work-around.
3.) A still image at the end of the video shook violently in the export.
I fixed that by being able to overlay the original CS3 avi over this area.

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