Man that sucks. I chased a similar problem for weeks when I had the Fitech and a distributor. It would just cut out under different circumstances but mostly as it got into boost. A buddy reminded me to make sure any high output wires weren’t running parallel to any of the ECU wires. Sure enough when I checked my wire runs I noticed my coil wire ran parallel to the ECU ignition wire, so I reran them but crossed instead of parallel to each other and boom, problem gone!
