I have an 01' Allroad 2.7t and at slight-normal acceleration in the brackets of 40-50mph I get a noticeable vibration/hesitation, but it smooths out after 50 mph. Tires have been balanced. Under heavy acceleration i do not notice any hesitation or vibration. If i accelerate like a grandpa I notice it. I let off the gas, it stops. I push down on the gas..it stops. I only experience this in drive under normal driving conditions between the speeds of 40-50 mph..any ideas?This isn't lag is it?