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Dodge/Chysler vehicles come with Champion plugs from the factory. There is no problem with them on these vehicles. Minivans with v-6 engines that are '96 and newer came with double platinum plugs. Onto the problem. You've done the plugs and wires, that's a good start. At the dealership, we only change those plugs from underneith, up the back side of the block. Granted we are on a lift. If there is a cylinder misfire occurring, the check engine light will be flashing. If it is a past fault, the light will be on solid. It's also really easy to get the plug boot alongside the plug rather than on the plug on the back side of the engine. It's no fun working blind. Other sources for a miss are the injector for that cylinder, the ignition coil, the valve train and of course piston/cylinder damage. The fault code will tell you which cylinder is at fault. If it is one cylinder in particular, ensure that there is good spark to that plug, if there is, make sure you didn't crack the porcelin while installing, it's easy to do on the back side of the block, I've done it. If plug and wire are ok, try to listen to the injector if you can get to it. Compare it to another injector you can reach. I have a mechanics stethoscope, it has a long rod instead of the doctors flat listening end. You can use a long screw driver instead. The only tank added injector cleaner I've seen work is called Techron. Buy the large bottle and add it while the tank if very low. The fill up. I haven't seen to many piston/cylinder failures. I've seen plenty of noisy valvetrains though on these engines. I have a Dodge Grand Caravan Sport AWD and a Chrysler Concorde. All with Champion plugs.
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