I have a 2002 4.2. I'm getting an intermittent problem. It will drive down the road just fine. Then it's like a cylinder or two has dropped out. It will go away after a little bit or if I turn off the ignition and start it right away. I get a P0353 code. I've changed the plugs, wires and coil pack. I see no corroded wiring. I've also tried wiggling wires as it is acting up. I gave up and took it to a garage and they could find no problem, they cleared the code and it's acting up again. it happens about once per drive.