Will just a coil help with misfiring?

I'm throwing codes 71-74 on a 99 turbo B18C1. I was wondering if just a coil would help boost spark instead of adding a whole ignition system....I've put in new plugs, dist. cap and rotor just incase you we're wondering. BTW, this code seems to go away in colder weather, but it sucks because I have reset the ECU every +- 5 starts and it's been throwing this code from the first day of turbo.