So I have a 2016 Chevy Silverado Z71 LT. I have a little under 5700 miles on it and have had it for 3 weeks. I loove this truck and especially when i first got it. But right now not so much! So anyways, I will be driving per usual, and its kind of random when it happens but once it starts it does not stop. So whenever i accelerate there is this faint fluttering noise that comes from the motor especially when i put it to the floor. The noise can be kind of described as a card stuck in some bicycle spokes maybe? I don't know, i have taken it to two different dealerships (chevy) and have driven around with some service guys and both have told me that this is a normal sound. For some reason I just cannot stomach that. So i went back and test drove another 2016 and it didn't make the noise at all so there is no way its "normal". Please if anyone can help let me know. Also I have read online that maybe its a U joint, Direct Injector or lifters? I don't know but any info will be great!