How do you supposed to get to the rear plugs on 97 grand voyager 3.3. Chiltons manual says remove windshield rocker. I removed the wiper blades and the rocker and still could'nt get to the rear plugs, Do I need to remove the plennum also and it looks like the alternator bracket, I looked under vehicle and it doesn't look like I can get them from there either, Van has 73,000mi, and still runs great but I don't know if I should trust the wires and plugs untill 100 grand like manual recomends. Any comments or suggestions would be helpful. Thanks to the group.