I've had all of the above as well as top end gears slipping and been putting up with it for the last 6 months. I've done my injectors, CAI, dump + cat, tune. Car went good for a few months then the stalling started. I'm no expert but after having the car checked out a few times I dont think it is any of the mods and am focusing on the transmission. reason why I think its all related to the transmission is; 1. happens regularly when going P->R or ->D (seems to pull the revs down just enough when going between these gears to make it stall), 2. seems to happen when coming to the lights and it changes down a gear (whether in auto or sports/manual) just as its about to stall if I quickly put it in neutral it stabilises instantly. I've already had the tranny serviced @ 30,000km and tuned but still happening intermittently. I've got the tranny booked in for stage 3 build to fix up the top end issues and overhaul/strengthen the whole box so I can comfortably do some more mods with out the fear the tranny is going to give out in the mean time. I'm hoping it will correct all these other little issues that I'm having. For the diff bushes I've destroyed the original set and had them replaced with some comp grade ones, its a bit clunky but feels solid as.