2002 Ford Taurus Hesitation / Miss

I performed a tune-up on the car, replacing fuel filter, plugs and wires. Still riding rough after tune-up. Mostly during acceleration. I went to one of those do it yourself car wash centers for a much needed soaking. After washing the entire car, I still had some time on the counter so I decided to lift the hood and spray down the engine compartment. Only sprayed it for a few seconds. Now it runs much worse and the check engine ( which has already been on ) is now flashing. Let it sit for a few hours once I got home then drove again. Seemed a little better, but still worse. I was thinking something with one of the injectors was wrong. But who knows, it never ran this bad even before the tune up. Also, I was wondering about the new plugs I used as they are not Ford brand. And the location of the PVC valve so I can replace that. THANKS!