2001 ford focus 2.0 dual overhead cam 4 cyl?

My fourth piston was miss firing and I found out it was a faulty plug so I switched it out now my car starts and idles great but when I shift into reverse or drive and push the throttle at all it stalls and then is really hard to start

Sounds more like a problem with the coil pack breaking down under load to me.

There were some cylinder head design problems with early Ford Focii, research TSBs on it, all kinds of problems were caused by this

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