Blew headgasket after 5000 miles. Pulled motor put in new bearings, etc. On initial fire up I had a lot of valve train noise. After about 5 minutes of listening to it with a friend, the noise quieted out. But it ran rough and rich. Over the last month I have put in a new cam sensor, the other had a lot of up and down play. Got a new 4" maf with sensor built in. Sent in my tranlator plus extreme and computer to make sure. Got it all back and now it's not running rich but it runs rough. Some coughing and sputtering. The coil pack and ignition module are only a few thousand miles old. I need to figure out how to check that to make sure. What now? Could this be something internal with the cam or valve train?