1994 Pontiac Firebird 3.4L Emissions

Im having trouble trying to pass emissions here in Colorado have changed multiple things and still having the same issue.
Things I’ve changed
-EGR Valve
-Evap canister
-Fuel pump
-Spark plug and wires
-Air filter
Anything else I should look out for I’ve hit a dead stop and can’t figure out where to go now
Would appreciate the help.