Yes check engine light was on for a year, mechanic said it was fine, all fluids are good, but yes when I drive it feels like it won't engage the next gear, neutral has a little chittery feel like something spinning freely. I paid $2000 for it put about that into it already, more than a 100 bucks, I'm calling wrecker up.Do you have a check engine light on?
Did you have transmission fluid level checked?
Sounds like a slipping transmission.