Thanks Dave and Steve for your input. All of these shots are animated stills so there are no pulldown issues. Some of my comps rendered smooth and others juddery. When I inspected them The ones that were rendering juddery were set to 23.98 and the smooth ones were set to 23.976. Silly me, I thought AE would see that as the same fps number. I changed them all to 23.976 and now they work in my FCP timeline. Thanks to your input I have now solved the problem.