[06SilverTurbo]

I have a 2006 vert turbo i have had it for about a year and 3 months, about a month ago i started to notice the engine was shaking a lot more than normal, a few days later the check engine light whent on , i did the key turning trick but there was no code i took it to autozone , they said that there was no code , they told me that it probably just needed a tune up , so i got new plugs wires and airfilter ,the car still shakes, and the engine light is still on . the check engine light is also statting to flash on and off. about a week ago i took it to a mechanic and he put a code reader on it, it said that i had a misfire in cylinder one ,I ask him if it could be the coil he said no because it was giving off spark , should i replace the coil anyways to see if it helps. this sucks because this all happend a little after the warranty ran out. Please any feedback will be helpful.