Stuck heat shroud and spark plug wires on back cylinder plugs

Try some penetrating fluid but that may make things slippery , You just have to work it till they come loose , there's a plug wire tool that I usually use , You're probably working blind too

The correct way to do this is to roll the engine forward. This may not be an option for the do it yourselfer though. You need to chock the rear wheels and set the emergency brake. Disconnect the upper motor mounts, put the transmission in neutral. Now pull the engine toward the front of the vehicle and secure it. You will then be able to get to the back spark plugs. Hope that helps! Jim

the manual tells you to roll the engine forward...like james is describiing. if kept in place , 6th plug is almost impossible to reach! my 2000 lesabre was rough. 2&4 were accessed underneath.