car have a heavy miss I have replaced everything except the coil packs

you can guess at it all day.but you will just be throwing parts at it again.you can't just go buy one coil for your car.there is 4 for the front and 4 for the rear,and made together,4 on one,4 on the other.so that's another $500.00-$1000.00,depending on where you get them.if you can get someone with a good scan tool,not code reader from parts house,they can tell you exactly what is wrong.