My Friend has one with the same setup and it doesnt shake at all. I know that all cars are different. Its good to know Im not the only one. Anybody take it to the Dealer and have them look at it?
The dealer might have put something less than 92 octane gas in the car. Even when you fill with super the engine does automatically reset (or takes very many miles), you need to pull two fuses and leave it overnight. Not sure as I am writing this which fuses they are, do a forum search. Mine still had a bit of a shake "sometimes". When I purchased and installed the Diablo tune I up'd the rpm 150. Now it's very smooth.
Aqua Blue 2SS c/w factory white strips, MT.
Tinted Windows, De-badged (I know, you know it's a Camaro !!)
Shift-up eliminator, Hurst Shifter, Borla Touring Cat Back