89 GT with stock heads and cam, performer rpm intake, 70 mm throttle body, on3 turbo, 50 lb injectors. Starts and drives pretty well. The issue I have is after it is warmed up it surges in park or neutral, in drive do not notice surging. A/F goes with surge, but have not had any success with modifying tables to correct. Attaching tune and log, any help would be appreciated.