Need help with ignition coil solution =/

Engine is shakey so I checked all coil packs and found the one that didn't make a difference when removed. So I switched it out, and it was fine for about a day, then the shaking started again. So I went back to napa to exchange the coil pack and replaced it for the second time and it is still shakey. Any idea what the problem could be? Not too mechanic savvy but can work my way around. Any help would be GREATLY appreciated! =)))





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