injectors are a definite possibility
you can undo the rails and with the coils removed (need ICM but you dont want spark) flip it over and plug in the inj clips and crank the car to check for any obvious spray pattern issues...sorta the hillbilly way, just be safe.
ive been finding all sorts of things as these cars get older....conector terminals with weak connections, corrosion, etc.
but that PCM threw me for a loop...ive rarely seen a GM obd2 pcm failure...especially one thats been with the car its whole life....
