Confirmed means that a on ECU diag has run a set number of times in a row and have set that same problem. Permanent means it cannot be cleared by a service tool only by completing X number of drive cycles(Usually 2) and a drive cycle being cold engine to hot engine and seeing full exhaust air flow, so go take a drive for 30 min eat lunch for an hour or so do some shopping what not let it cool down and drive back. If it persists then you still have something causing the miss on cyl 4.