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Does it misfire both at idle and while going down the road? Thanks.
So you are saying it runs better now or runs worse? Does vehicle burn oil or get poor mileage?
I would start by doing a engine cleaning treatment as these engines are known for carbon buildup on valves. You can pour seafoam directly into cylinder 4 and then let it sit overnight to soak. In morning run at low gear in high rpm to burn out carbon deposits then I'd replace the spark plug on cylinder 4. If coil was problem it wouldn't be intermittent and I doubt new injector is already bad. Let me know if you have more questions, thanks.
I meant to say cylinder 1, sorry about that. Coil cables wouldn't be a intermittent problem either. Let me know if you have more questions, thanks.