Kobelco ed150 won't idle up

Hey I have a kobelco ed 150 that was caught in thesearch California floods. Took water up to the base of the engine.The equipment was retrieved changed batteries and starter. It ran great after for a couple days. Went to start it up today and it has a step motor Ng code and a e/G Rev code. It starts but sounds like it's only running on 2 cylinders and won't idle up

Kobelco ed150 won't idle up