car sputters and idles rough when wet on 2002 Ford Escape

I have had all of the spark plugs changed, the gasket resealed, and had it checked again and again. The engine light comes on, then the car idles very low, around 500 RPMs, and sputters. Could it be the coils? If so, what should that cost?

Asked by for the 2002 Ford Escape
What codes are causing the check engine light to come on?
1 more answer
mine did the same. We bought coil packs from O'reillys for around $70-$75 each. My light was giving me a cylinder misfire on 4 & that what your light is reading?