Mickey Beau

Hello i have just bought a secondhand Dodge journey SXT Automatic from a dealer today (Saturday) i haven't a clue where to post this, but when i was driving on the motorway i lost power when i reached 80mph, the engine still revs, well the rev counter moves, i was wondering if it might be automatic fluid that might need topped up has anyone got a clue what it might be ? oh and the engine light on the dash the one in the middle looks like the engine is on orange