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I wouldn't think you'd be able to hear it, although you might hear the solenoids(injectors) operating. Mine click pretty noisily, but they are Ford SVO's, the factory GM injectors weren't nearly so noisy in operation.
Hood Up?
Air Fiter Top off?
Or Bare TBI Unit?? or aftermarket Tiny plain paper Filter?
In a One Car Garage with good Acoustic's?
Basicaly Stock Exhaust,,???
>>You did say you were Just sitting in Cab,,
Not Driving??,,It has a Distinct Sound,,,"Harmonics"?
Some are Louder It seem's,
,And Some People Have Great Hearing,,
A/F Being Mixed,,, before going Down Internaly,,!