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A bad coil can cause the misfiring and tach bouncing. Dont forget thats how it reads rpms so if its messing up it'll also send a bad signal causing the bouncing. Try using another coil possibly the one from the guy you tested the bad coil on, since you know he has a good coil.
If that doesnt help, than using a SRT-4 coil can help, if you can try using a FORD EDIS coil, they've been proven to LOVE BOOST, offer great charging and have a more powerful spark than some of the coils out their.
Can you post up your MSQ so we can check it out. Also tell us what code your running.
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