SLUDGE is the problem in most cases. The computer says timing or cam phaser. You can stop and even reverse the problems manifesting from the sludge if it is not to late. Before it gets worse give Jilcat a try. The rattle or knock (or both) come from the loss of oil pressure to specific places in your engine.
The Jilcat Proline product for Gas Engines will clean and condition the metals in your motor which will help the oil pressure return to its normal flow and pressure. The Jilcat product will also almost completely remove friction and help the advance timing function as specified.
If your crank shaft hasn’t not already gotten damaged along with the main bearing you can potentially quieten the knock and stop the rattle of the lifters. Before you allow the shop to buy another used engine or do a complete rebuild, try the Jilcat Proline Mopar Kit.
Your 4.7 gets power from timing advance as the RPM’s climb. The timing advances because of the oil pressure increase. The oil pressure cannot increase due to blockage from SLUDGE. Gene Daughtry discussing sludge and how it effects a buy here pay here dealer. JilCat Proline Products help solve sludge issues and reduce costs by reducing mechanical problems in the higher mileage vehicles we sell and maintain for our customers.