Lately I have been having some issues during cold starts. Sometimes after starting the car, the car will vibrate a little and the CEL will flash for about 10-20 seconds, afterwards the car will idle smooth and the CEL goes away.

I scanned the codes and it was a cyl 4 misfire. Now I had all my coilpacks replaced with R revisions about a year ago, (i thought R coilpacks would last longer) so I figure it could be just bad luck, so I had that one changed out along with all 4 sparkplugs and threw that CP in the trunk. About a week later, the same symptom happens again, this time its cyl 1.

Now could these actually be bad coilpacks or maybe some moisture getting in there or something else major? I also had a P0441 EVAP - incorrect flow code show up, and the purge valve was replaced to fix that, not sure if it is related.

Any help is appreciated.

Thanks.