when i was driving my car i noticed that it had a slight off idle miss/hesitation to it, so as anyone else with an LT1 would say "@$&! time for plugs and wires"....but then i was playing with my intake inlet and noticed that the TB had a lot of carbon build up, so i hit it with some carb cleaner, made it shine all pretty, took it out and now its revving clean all the way thru the range...just something to look for if you have this problem now/later on

 

Sometimes fuel pump.