1994 Chevy K1500 305 CI TBI engine

Recently replaced intake manifold gasket. No issues doing that part. The distributor comes out, but have retimed the engine. Have a buzzing sound from one of the TBI fuel injectors that I haven't heard in the past. The jets appear to be spraying. I rechecked the timing and advanced it to 2 degrees since the engine had very little power with the timing at the manufacturer recommend 0 degrees. Not sure if I need to replace the injector or not. Any advice would be helpful.

Thanks,
Ric