so i parked my car on friday night and it was running completely fine not a thing wrong with it and i go and pick it up about 30min (sunday night) and it runs like crap part of the time. it revs fine but when im in gear and floor it it goes know where then slowly speeds up and all of a sudden it goes back to normal and i take of (well spin the rear wheels) the cars an automatic and it does it in every gear. but when in park or neutral and i rev it its completly normal.

usefull info:
its been raining for the past 2 days and the car was out side
my air fuel guage is constantly saying rich (normally it goes back and forth)