i washed my engine last night and now i cant get it over 2000rpm i repalaced the mass air flow sensor and that did nothing if someone could please help me or point me in the right direction i would be very gratefull i only had the car for a week now. ps it ran great untill i degreased the engine

 

wild guess, but maybe the pressure from the water knocked a wire/harness loose. You should check all your connections as well. Just a thought.