I have a CPO 2013 SHO with 48k miles that just has powertrain warranty left. I have three problems and I'm trying to see if it's something I could fix myself. First problem is the A/C fan fluctuates intermittently. Second problem is there is a slight surge when driving at a steady speed. If I'm doing 40, it constantly has a very slight surge that you can feel. Third problem is when I'm driving in first at slow speed and let off the gas, it noticeably kicks into second very hard. This is the only gear it does it in. Pretty sure this will be covered under my powertrain warranty. Any help is appreciated.