missfire on cyl 1&6 or it seems that way

ok lets start out i have a 1992 jeep cherokee sport 4.0l i was driving on the interstate when all the sudden it went from running great to crap i still drove id say about 6 miles like that i get it back to my garage and i thought it was the converter pluged up cut it off same issue its missfireing on cyl 1&6 ive swaped plugs wires there gettein good blue spark it runs really rich so thought and injector was stuck open replace all of them the MAP sensor I am lost can some one help me