does anybody know if I could take a PGM intake manifold off of a 1991 1.5L out of my 91crx and put it on a 1998 1.6L? would it work? and what kind of problems would I encounter if it is possible?

its possible but one of the main thing's you'll have a problem with is the map sensor and the bolt padders will be way out of wack (not lined up like they should be) so its not worth the time and money.

but about the not bolting up part im not sure if it will wont .

pretty sure all d series have the same intake bolt pattern but as for the MAP on your E.F its on the wall unlike your EK which is on the vacuum cleaner. not worth the time, money and no hp gain. you gotta tune those hot air intakes.