I purchased my ram new in july 2011. Up until recently it has been perfect. It has 16064 miles on it and the check engine light came on but i didnt notice any performance issues. I took it to the dealership to get scheduled in and they hooked it up to the computer and said it was only a missfire. I kept driving my truck and it only got worse. Loud knocking and backfiring and missing and valve noise. I took it back to the shop and they actually did a little bit of diagnostics on it and found the cylinder head had broke where the rocker shaft bolts to it. I have also had a grinding noise when losing traction when braking.