What would cause a car to act strangely after leaving a car wash?

John G: What would cause a car to act strangely after leaving a car wash?
My girlfriend has a 2002 Hyundai Accent with about 130,000 miles. We took it to a car wash. After leaving the car wash, the check engine light started flashing and the engine shook. After about 15 minutes the shaking stopped and the car drove normally again. This happened about 3 weeks ago and there have been no issues since then. What would cause her car to do this?

Answers and Views:

Answer by Will S
Ugh wetness on the ignition system.

Answer by Mike B
Plug wires got wet and were arcing to the block. If original wires, good idea to replace them.

Answer by talon699
Both previous people were correct. Wet ignition wires. Solution . Replace spark plug wires as well as cap and rotor

Answer by Firebird
“What would cause a car to act strangely after leaving a car wash?” That would be water. Yep. No doubt.

Probably, her spark plug wires are not all that great, and they threw some sparks when they got wet.