What was found
ENGINE START, TAXI, AND CLIMB UNEVENTFUL. CLIMB FROM 5000 FT TO 15000 FT, TURNED ON ANTI-ICE SYSTEMS, PRIOR TO ENTERING CLOUDS AT APPROX 6000 FT, LT ENGINE FLUCTUATED AND ROLLED BACK SHORTLY AFTER ENTERING CLOUDS. ENCOUNTERED ICING SHORTLY AFTER ENTERING CLOUDS. TRIED TO CATCH ROLL BACK BY TURNING ON IGNITIONS WITH NO SUCCESS. SET UP FOR STARTER ASSISTED START. ENGINE CAME UP TO SPEED WITH A SLIGHT RUMBLE. UPON DISENGAGING STARTER, ENGINE ROLLED BACK AGAIN. SET UP FOR A FUEL COMPUTER OFF AIR START. AGAIN ENGINE CAME UP TO SPEED WITH A MORE NOTICEABLE RUMBLE. UPON DISENGAGING STARTER, ENGINE ROLLED BACK AGAIN. SECURED ENGINE AND RETURNED TO DEPARTURE AIRPORT. (362.7 HOURS SINCE LAST MPI)