4-cylinder, I ASSume?
Those are wasted spark, meaning if the coil was bad, it would effect #3 and #4
The FSM diagnostic page for P030x is 5 pages long, checking wiring, power supply, injector, vacuum leak, spark plug, compression, etc.
If you know the plugs are good, I'd swap the injectors on that side, and pull the vacuum line off the regulator (vacuum dumps right into the #3 plenum). If it doesn't follow the injector, print out that diagnostic, get your DMM, and start testing.