So I was driving to work and boom my crap just started to crap out on me. The CEL is non-stop flashing and the car shakes/vibrates. I just changed one of the coil packs two weeks ago because one of them went bad. I checked the codes and got P0300, P0303, P0302 and P0304. If its coil-packs not sure why P0303 comes up if its brand new on that cylinder. My first guess is that it is the coil packs, any way to check to be sure and to know which ones exactly? It may not even be coil packs, but it is likely right?

 

Change all the coilpacks, they do this, if you change only one stuff like this tend to happen.