as the title states I've been experiencing rattling that starts around 2k on up mostly in the 2-3k range and only happens under very light throttle once I put the throttle down more or go WOT it stops this is also causing false knock on cylinder number 3 when this happens which pulls timing. it does it bad sometimes on the highway because the conditions are perfect for this to happen as the rpm are right in that range and throttle is very light as well. My ap only shows knock during these specific conditions and only on cylinder 3. I am running a stratified e30 flash with a revision and no I don't think it's the fuel my e85 tested 90% and the fuel qualify is amazing overall and I'm getting positive corrections on all other cylinders even during these instances. as I stated once I go heavier on the throttle or WOT it's business as usual there is no knock detected and I don't hear anything rattling or pecking and the car runs great. if I drive easy and keep rpm below 2k or so I don't have issues either and I don't have issues with this even in that rpm range unless I'm very light on the throttle. I been running this tune for months with no issues until the last few weeks so no I don't believe it is tune related either. I can't imagine there is engine damage because it runs fine when hard on the throttle which does not seem like it would be the case if there was engine damage. I recently changed the oil and changed the trans fluid to motul 300 I checked the ngk plugs I put on 5k ago and all seems well there no issues to speak of. I am running out of ideas. I checked my rmm and noticed it wasn't as tight as it should be but I tightened it up and it did not fix the issue. Any help would be greatly appreciated it's driving me crazy and I'm running out if ideas and it's a real downer. it makes me not enjoy my car nearly as much as I once did. it doesn't really make much noise idling but it has made the pecking sound before at idle (tune has my idle set to 1000 for rmm vib purposes) but it is mostly in the situations I described and usually cannot be heard at idle. I can hear it when I Rev the car up past 2k when in neutral or with the clutch pressed it makes no difference but it only does it if I am very easy on the throttle while easing the rpms into that range. I'm stumped any help would be appreciated