well finally decided my truck needs ne plugs, she has 70k on her and she dont have the power like she used to.
sicne the back 2 cyl are kind of under the cowl, is here any easy way to change them out? any tools to make my life easier?

 

I don't know, but there are several other things that might cause it, like a dirty MAF, clogged air filter, bad catalytic converter or dirty fuel injection system. I would get a spray can of MAF cleaner, take the filter housing/MAF housing off and clean the MAF. Check the air filter at that time, as well as the air intake area (open the driver's door and look toward the front through the gap) in the fender for debris build-up. I have used a shop vac to blow the debris out of that area and clear the intake but don't do that with the intake tube attached - the crud might get into the filter housing. When you remove the intake tube from the throttle body, look for carbon build-up in the TB. Use TB cleaner spray accordingly if needed.
If you have not been using any kind of fuel treatment/cleaner, you may have gunk in the injector logs and build-up on the injectors, particularly if you use Ethanol-blended fuel most of the time. Additionally, you probably should change the fuel filter and check the fuel pump driver module above the spare tire. If it looks corroded, replace it.
Of course, it could simply be engine wear too, but hopefully that is not the case.