92 S-10 Blazer Engine Lopes At Idle

I Have a 92 S-10 Blazer and the Engine Lopes At Idle
I have replaced a lot of parts like injectors, fuel pump
Fuel filter, map sensor, spark plugs, wires, cap rotor,
Distributor, O2 sensor, coil, tps, and I have check the
Egr valve and for vacuum leaks what else can cause
This

Scott