Our 2006 Commander Limited with 5.7L Hemi and 105,000 miles is throwing a P0306 code for cylinder 6 misfire. We have ruled out the plugs, coil, injectors and now it's at the dealer. They are saying it is either a bad lifter, pushrod, or valve and it may or may not have ruined the camshaft. With the valve cover off and engine running, that cylinder's rocker arms will randomly not move up and down.
I am reading that the early hemis had a design flaw and this is a common problem, so here are my options with cost.
1). Dealer fix the issue, remove head and replace components and reinstall. Total $1500-2200. Risk: this could happen to the other head anytime in the future at the same cost, then I'll have almost $5000 into an engine with 100K miles on the bottom end.
2). Dealer install reman engine with warranty. Total $4000 for engine and $2000 for labor, total $6000
3). Buy reman engine and install myself. I've done many engine swaps and have all the tools/lift, etc. I'll save about $2000 doing this. Not sure I want to spend 3-4 days doing this though.
The rest of the car is in mint shape. What say all of you? Wife loves the car, but I would hate for this to be just the start of a ton of problems...