I've got a minor adjustment that needs to be made on my 2010 ZR1. The check engine light comes on. This happened about 9 months ago and Bellavia Chevrolet (a GM dealer) fixed it. Just recently, the light came on again, and I took it to Bellavia Chevrolet again. This time they did not fix it and gave me lousy service. I need to go to a reputable reliable dealership in the NYC area who can make the adjustment for me. Does anyone know which dealers in NYC are good and which ones are bad. How's Potamkin Chevrolet? Has anyone had any experience with them? Thanks!