94 4Runner shifting problems

My 4Runner has about 142,000 miles on it and has recently started acting up. When I first start driving it after it has sat for a while, it does not want to shift gears. It will drive like that until it has warmed up and then it runs fine. Is this something I can fix at home and what should I look into first? Thanks!!

If you haven't already, you may want to stop in the Toyota forums and ask. You're more likely to get someone who knows your answer.

Thanks. I already did that as soon as I found another forum.