The fluctuation could be mass air sensor....but since it does it at other rpms under steady throttle, check out the throttle position sensor. Also, has it thrown a code, is there a check engine
light on or any indicator on in the cluster? The higher rpm noise....without a description now way of knowing.
Grabber Blue "Betty" 2012 V6 Six Speed, 3.55, BBK cai/throttle body, longtubes, x-pipe, axle back w/oem tips, Lugo Performance Dynotune, Zex 100 dry. I need factory v6 foglight housings, and the stock 11/12 gt grill with the light housings.