The car runs and drives fine, but when I build boost its fine up to about 13-15psi then stumbles and coughs. I had a no start issue that turned out to be the crank sensor, so I fixed that and the problem remains. I have replaced coil pack and module, wires, plugs, and o2. Still it remains, it happens when the alky kicks on so i am unsure if it is the alky kit or something with the car. My settings on the box are turn on 13-15, max 26. Its an SMC progressive. Any ideas?