How hard of a job is it to replace the plenum gasket, and where exactly is it located on the 3.9 in a 1999 model? I have the Haynes manual and "plenum gasket" isn't even listed in the index. Is it just the intake manifold gasket?

 

It's not too bad, here is a link for you. I'd say the toughest job is getting off all of the old gasket material!

http://www.bobistheoilguy.com/forums...Number=2320358