I've been working on a few driveability issues on and off for a while now and I sorta have it down to two things. The vehicle is a 04 Tahoe with a LQ4, 862s, 224/228 113lsa cam, 5 speed swapped, LS2TB, NNBS Intake, and runs 93 only.
First is rpm surge during deceleration while in neutral clutch in or out. For example when coming to a stop from say 45mph as soon as the clutch is in or the transmission is in neutral the RPM quickly drops down to idle around 700 and holds fine until right at 15mph where it jumps up to around 1,300 and hangs for a second before slowly dropping back down. This can be found between1:19-1:21 in the A1 log
The second is that sometimes instead of surging up at about 15mph during deceleration it stalls and shuts off. I do not have a log of this as it is rare.
Just looking for some direction on what to do next as I am kinda out of ideas and don't want to go shotgunning stuff.
Dan Mod 53 Minor idle spark reduction..hptA1 Surge.hpl