I am having the same issue intermittently. I have 3.0L, with new coil packs, and I have a new coolant sensor as well. I get occansionally codes P0 300, 302, 303, 305. My car runs rough for a few minutes and then it fixes itself. I have been waiting for the problem to get worse. Now, I am looking for answers. Thanks!

 

buy a cheap Vagcom cable and try to meassure blocks to see misfires in real time.

 

a knock off version of vagcom will not independatly read blocks. U need the real deal for that type of work.

 

you just need to read block 15 and 16 you can do that with a cheap vag cable