1988 Dodge Omni check engine lite on

Have done some exhaustive t.S. On the ck englt get a code 32 from the obd 1 computer, have tried blocking off the egr ports for t.S. Purposes, replaced the egr valve assy, checked the entire engine for vacuum leaks, exhaust leaks. Engine runs smooth at idle andthru all phases of operation, no set mileage as to when lite comes on can be as little as 10 or as many as a 100 miles any ideas as to helping, fresh tune up new plugs, wires, cap/rotor, air/pvc filters pcv chvalve currently stumped, mark