idle pulse misfire

04 Cobra 2.76 Eaton 340lph pumps pulse width modulated Bolt ons 60 lb. Injectors The car was tuned remotely and runs strong under wot. Tuned to lambda of 0.78 at wot and did all part throttle stuff. Week later I noticed an idle puls . It happens if I clutch in and go into neutral at any kind...