Quote:
Originally Posted by Jagerday
I cant believe no body has suggested the old fuse pull. If you just picked it up the dealer probably put 87 octane fuel in it. This will change the tables. I would fill the tank a few times with highest octane possible wherever you are. Than pull fuses 5 & 20 and keep them out overnight. This will reset your tables to high octane fuel. This might be the issue, might not, just my suggestion. But a good rumble out of our big beastly LS3's is normal.
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I might as well try this as well. When I test drove it, the dealer mentioned he drove the car for a week when they first got in ( bought it used, 5,000 miles ). We were just bouncing questions around and I mentioned the using of premium gas, which to my surprise he said " oh, really ?, never heard of that ". I assume they had been filling it up with regular since they got it.