2000 Kia Sephia idles funny after I washed

I washed the engine in my girlfriends car afterwards I tried starting it, and when I did it idled horrible so I turned it off and inspected the engine I found that the air filter cover was open so I popped it all the way open and took the filter out and saw a decent amount of water inside I tried letting it sit and I tried running it off but nothing works should I change the oil or should I let is sit longer or well yeah

Sorry for the punctuation and spelling please help this is our only car and we both need it for work thank you, my name is Jacob