Getting ready to change the plugs in my 06 300 base 2.7 L model.
Mileage close to 90K, MPG starting to suffer, originally was 27 mpg on the open road, now approx 23-24. I need some imput on the procedure for the plug change?

* I know the upper manifold needs to come off, Q-does the manifold need to be torqued when re-installed? Also is their a gasket that needs to be replaced, etc.?

* After the manifold is removed the next step is to remove the individual coil by removing the bolt and the boot? Is this correct?

* Remove plug - install plug, re-attach boot w/ bolt and re-attach manifold? Anything else? Any help/suggestions greatly appreciated!!

 

get EGR rubber o ring gaskets they are known for amateurs to cut them when installing or removing the intake

 

Yeah, I picked up a set of EGR gaskets prior to the manifold pull, everything went pretty smooth. Still never really found out the manifold
torque though. Spoke to a few other mechanics they didn't know either,
and could not find anything on the web. So i just torqued down minimal and snug, seemed OK after start. Other than that it went good. Auto manufactures making it tough these days, wished I was working on a 283 or 327, what a breeze..... thank's for the return.