My 2006 Jeep Wrangler X 4.0 has been checked for sensors, electrical and timing. Finally the last mechanic that looked at said the gear on the bottom of the distributor and the gear on the camshaft were worn. He said that the shavings from the gear may have gotten into the engine and could cause additional problems and suggest that I have a new engine installed, for a mere $6500. Is it possible that only the camshaft need to be replace and how much should I expect to spend to do so? My wife and I are retired and live on a fixed income, so money is tight. I don't want to do more than I have to getting this jeep running properly. It seems to run ok, but a check engine light comes (P0016) and they have ruled out sensors/or electrical being the problem. If anyone has any experience with this problem please let me know what I need and what I can expect to pay for labor.