I have an 08 saturn aura with the 3.5. I am working on getting my tune buttoned up. I noticed at cruise i am getting knock. I am also having trouble getting more timing up top. I have no knock when i am 1/2 throttle and up but i cant command more knock. Any input on how to go about getting this thing buttoned up before i start doing more work with the engine to get more umph i would appreciate it.