Replaced stock LS3 due to dropped lifter @ 114K miles with LS376/480 GMPP. Local shop dyno and tune but I'm not really excited with their tune. Idle is very erratic +/- 100 RPMs. Does anyone have a base LS376/480 tune I can compare my file to or better yet advice on tuning a C6? I'm new to tuning with HPT and I don't have much trust in the tuning skills of Northern VA.
P.S. Not really an issue, but fuel mileage has gone.....
Last edited by C36Maverick; 04-24-2019 at 01:53 PM.