It does sound like an ECU problem. You can use an analog ohmmeter to read any stored codes.

Check MontyMcV's site for the Montero FSM, download it and follow the instructions for pulling ECU codes. That's a strange problem, but you have to start the diagnostic work somewhere:

Mitsubishi FSM links and a lot of other good stuff that Bill is kind enough to host

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum