Random check engine light

What is your question?

Randomly after cleaning the engine bay with a rag and some water, it’s got a solid and flashing check engine light and now it idles really rough.

What makes this problem better or worse?

When it’s idling at a light or in general, after a while of driving it’s got a real bad smell

How long has your 2000 Lincoln Town Car had this problem?

A few days