Hi all, I have a 93 V6 4x4 auto 4-runner with about 170,000 miles. While driving at ~30mph the tackometer rpm's started to go up, then go down....would stay up for a while at around 3,000 rpm's, then go down without any acceleration or deceleration on my part. I'm thinking it's transmission. This one is most likely an easy one to solve for some of you. What's going on? Thanks!