Whats the best treatment for the top and where are cam sensors located

Hello, I'm not sure what your questions means. Addressing your symptom as described, I'm not even sure what would cause a harsh downshift simply by letting off the accelerator pedal. If you have diagnostic trouble codes setting, it could be a helpful and important clue as to figuring out what's happening and how to resolve it. But, simply 'resetting' the code isn't going to be enough. Troubleshooting will be needed to trace the root cause of the problem. You're going to need some professional assistance to figure it all out. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops