Re: 99 Dakota pinging problem
There is a TSB for the Magnum engines relating to spark plug wire routing and crossfirebetween cylinders. I'm not sure of the TSB number. Basically it involves rerouting the coil wire to the intake side of the valve cover and rerouting the rear wires so they don't run side by side. Cylinders 5 & 7 are the most effected as they are next to each other in the firing order and position of the cylinders(drivers-side, rear 2 cylinders). Crossfire here can cause very advanced spark timing in cyl. #7 which if left unchecked can damage the engine.
Try this,re-route the rear wires so that the #5 wire crosses over the top of the valve cover and the coil wire is on the intake side of the right valve cover. Drive the truck and see if it makes a difference. If it does, take it back to the dealer and have them re-route the wires according to the TSB instructions. Dealers get paid by Chrysler to do warranty repairs and they should be happy to try this easy repair if it would make you happy. (Remember them when Chrysler sends you the satisfaction survey).
There is a reflash for some of these cars also that cured the full throttle ping in my brother in laws' ZJ. If the dealer won't help, I recommend calling another dealer(Chrysler,Plymouth,Jeep are approved to work on Dodges also)or the Chrysler zone office.