I have recently purchased a mk1 1

I have recently purchased a mk1 1.4lx focus which is running rich there is no maf sensor on the vehicle and no visible wiring showing there ever was also I cannot see any map sensor around under or near the inlet manifold or behind the altinater the Haynes manual I have says it should have a maf sensor but it does not look like it has been removed as there is no loom for it or wires that have been cut if I purchase a maf sensor and wire it up as the Haynes manual says or will this cause problems thanks ipb