I'm having wet weather starting problems and suspect the plug wires,etc. BUT.....how the heck do you get to the 3 rear plugs? They're under the intake manifold! I've changed the wires and plugs on my Nissan Pathfinder (which wasn't alot of fun), but the Avenger looks brutal. Any idea what a shop would charge or time needed to replace those wires and plugs? Thanks.