I guess fuel system

I got caught in a rain storm last Tuesday coming from under a bridge ran into alot of water. No water got in the car but since my car has been hesitating. With foot on gas pedal it takes a bit to pick up speed but when it does it takes off. Now I have done a tune up spark plugs, coil packs, and wires. I have used the throttle cleaner as well. It still does it. At time I can get in the car and it run fine but other times it hesitates and acts like it don't want to pick up on the speed right away. Any suggestions?