RPM drop while driving.. car switches off after idle power while on neutral.

Washing the engine has become an epidemic it seems .. Unless there is a fire or is being done by a professional automobile detailer .. WHY anyone wants to intentionally spray water into the engine bay and onto the engine remains a mystery to me! ... There is no repair protocol for water intrusion within the electronics, sorry. Local repair shop may try to help, good luck! https://repairpal.com/repair-shops