Stalls and shuts off when it rains

Hello! The car will stall and shuts off whenever it rains or at the car wash. I checked for vacuum leak, wiring issues, found out the car was hit by the fuse box but all the wires underneath the fuse box look okay. I also checked for grounding issues, looks okay. I also took the upper intake off to see if there are any water and the coils are dry. Sprayed the engine bay with water to see what's happening and the rpm will fluctuate between 500 and 1,000-1,500 rpm's before it shuts off. Could it be the throttle body? Car will idle sorta fine when I unplug the MAF sensor. Although the MAF was replaced recently, could it be faulty?