Have a 2006 Silverado 4.8 that had a lifter going out. Replaced cam with a BTR Stage 4 Truck Cam Intake/Exhaust 0.553", 109* LSA, also installed long tube headers. After getting everything back together I started the truck and it had a tick/tap with perfect oil pressure. Ive swapped cams in the past and had the car run... ran like crap but would run on a base tune enough to limp it to the tuner or atleast on a trailer. Never had one sound this way and the sound wouldn't go away no matter what I tried from re torqueing the rockers and checking push rod lengths, to going back in the motor to check crank to cam timing which was dot to dot. So I went to replace my lifters again thinking this was the problem only to discover the the engine is now pre igniting/ detonating. Mostly in cylinder 7 and 8 with some signs in cylinder 5 and 6. When I checked around but most local tuners won't touch it due to liability and has forced me to try and get this thing going myself. So I bought HP Tuner and went in a raised my idle RPM and and Idle Airflow so that I could get the thing to stay running without my foot on the throttle. I am currently running a tune that a friend who "knows some things about tuning" helped me start that idles with little to no detonation until you give it throttle and some times when the engine is hot it has a light sound to it. It mostly has detonation between 900 and 1500 rpm and goes away above this rpm range in park but it is some what noticeable in most ranges in gear being less noticeable at higher RPMs. Sound tries to go away at idle but still can't quite figure this one out. Just started tuning this so bear with me as I am learning. Don't have a wideband yet but I am in the process of getting one soon. Attached is a stock tune, tune Im using, and the a log at idle and driving.