95 Jeep Grand Cherokee, My jeep has been doing this for awhile now. It started in the

[Ian]

winter. When I'm at a? full stop and start to accelerate, it revs up to 3-4 thousand and cuts back down. I've noticed when I go to 30-35 mph, it will rev up to 3000 to 4000 rpm and then cut back down. It seems like its having a hard time switching gears but eventually does. After I pass the 30-40 mph mark, I don't have any problems. I have an automatic V8 5.2L Jeep Grand Cherokee. Please let me know what you think! thanks