1987MazdaRx713b

im new to the rx7 i just recently traded a 1992 honda civic for a 1987 Mazda rx7. the guy who owned it before me did an engine swap on it .. my motor has 24000 miles on it .. but he did a shitty job .. ive been looking over stuff and he cut out the ac and theres cut wires and other things. i was lookin over it the other day and noticed their was a broken vacuum line .. it goes to what looks like a seleniod with a 2 or 3 way valve ... theres four identical ones... the 1 i need goes to a blue connector.. if there anyone fimilular with this engine that can give me some advice please do