Came home parked the car, everythings fine. An hour later went do do some driving and immediatly the car wouldn't shift correctly. I have to take it up to 3500 rpms then let off the gas for it to go into second. It also doesn't seem to want to go into overdrive on the highway. Had one O/D light flashing episode but none since. Rained recently and had to navigate some large puddles. Oil level is fine. Any ideas? Thanks, John