Hey, Latly I've noticed my car is sliping out of over drive. I dont know why, it only dose it at high speeds (60+) it just like jumps from 2200 RPM to 2700 then back down, then back up. This continues untill i ether turn off over drive, or slow down. any ideas? I have no clue how I could have f....ed up Overdrive... 1st or 2nd i could see but there fine.