[nicserrentino]

So I noticed a weird sound while cruising around 80 mph on the highway, and it’s hard to explain how it sounded. Basically I was cruising and only giving like 10% throttle and it almost sounded like it was hitting the cam lobe while driving. It’s never done this before so it caught me off guard. And this is around 1500-2000 rpm. When it does it, if I give it more gas the ‘lope’ speeds up and then goes away. My car is the A10, it’s FBO+cam, flex fuel, pulleys, etc.
The only thing difference between the drive that I noticed it and the previous drive is that I filled my tank up with maybe a 65/35 mix of fuel. (E85/93)