Have a swapped ls2 440 cube 12:1 compression motor running pump gas. Everything is ok, still need some dyno time to dial in timing at W.O.T but the start up and idle as you know takes time. Open loop the idle is where it should be but once in closed loop after about 30 seconds like clockwork the rpm will increase 100 rpms. Doesn't matter if the engine is cold or already warmed up it's only after entering closed loop will it increase. I can change the idle speeds in the charts and it will always go up exactly 100 rpm. I've seen a few posts commenting about this but no answers. Here is my tune along with as comprehensive log and setup as I can offer. Any help would greatly be appreciated. Larry