Check to see if you placed the coil packs in the right cylinder. I had a misfire in cylinders #1 and #3.....put the coil packs in the proper place and everything was fine. doenst hurt to check and make sure the coil pack is completly snaped on to the spark plug (speaking from experience). check spark plug to soo if its properly gaped or dirty (nothing alittle carb cleaner cant fixed). Worst case scenario is you purchase new spark plugs and coils to see if the problem can be eliminated with new products.