1. Your lower o-rings are pinched in those two cylinders, so fuel is leaking into the cylinders. You would smell fuel from your exhaust gases if this is the case. Don't drive the car as doing so may result in hydro-locking the engine.
2. Something happened with the injector wiring during the plenum pull. Old engine wiring harnesses can make the copper wires inside brittle. This happened to me. One of my cylinders was dead after doing a plenum pull. It wasn't the fuel injector, it wasn't the coil pack, etc. I ended finding that my ground wire to that injector connector had separated somewhere up in the main harness area. I ended up tapping into the ground line from the connector side of the bad wire to the ground wire of a neighboring injector wire. This is OK since all injector ground wires get tied together in a common ground at the ECU.
You can test to see if you have power at the connectors using a multimeter.
