I have a 2003 dodge ram 1500 with a 5.7 hemi, it acts like it is running on 6 cyclinders. And will not stay running under 1100 rpm. The code scanner said multicyclinder misfire. I have changed spark plugs, cam señor, crank señor, changed one new coil pack (moved to each location) with no change in running condition. Please help.

My experience with Chrysler products is to only use the same Champion spark plugs that came in the vehicle. Other brands of plugs break down fast and cause major problems.