Is the coil ruined?

An idiot power-washed my engine - hard.

Now the car makes a put-put noise, and has little power. It sounds like the engine may die when the gas pedal is not depressed.
Someone said it may be that the coil got wet. If so, will it dry out and be just fine, or do I need to replace the coil?

The person who did this came and looked at the car again and checked the spark plugs. There was water in the black tube things but he shook that water out.

I won't let him touch the car now. What do I do?

I'm a 62 year old woman who knows little about cars.

Thank you very, very much!

Allene