I got my UTEC stage 3 tuned at curry's automotive in virginia last week and took my car out to the track tonight. I think im getting knock in 3rd and 4th gear but not sure if thats what it is. In third around 5500 rpms the CEL flickers and goes away and feels like the car doesnt want to pull for a second then goes to normal then same thing in 4th. What is this? Also do you think I should just take it back to the shop and they should fix it for no extra charge or should I expect another tuning charge?