For instance, let us know whether the problem occurs during acceleration, under braking, while cruising at a steady speed or only at a specific speed. Believe it or not, weather can affect your car's performance, too. So we will be interested in knowing if the problem occurs on rainy days, on hot days or on cold days. If the problem is more prevalent when your fuel tank is low, that would be something we would want to know. Likewise, any unusual sounds that you can relay will hint at where the problem lies.
Communication is the key.
Ultimately, we want you running and back on the road as soon as possible with all your service and repairs performed correctly the first time. It'll give us a leg up on diagnosing your problem. When a problem occurs, the more you can describe about its symptoms, the better. It is a good idea to list the symptoms you observe and bring that list to our shop. We would also appreciate it if you were prepared to discuss those symptoms with us.