Where can you get detailed intruction on how to change plugs and remove the intake manifold for the back plug?

I find it quite amusing that you want detailed instructions with out providing any detailed information. Do you think all engines are the same? It is one thing being a cheapskate, but another being a lazy one.

Frankly, I won't waste my time. go buy a Chilton's Manual or visit Alldata.com for your job.

Rear plug on your boat???