Hi… Hope someone can help..

I have a 97 Pajero Pinin GDI 2.0. I’ve had it for 5 years. About a year ago the car just didn’t want to start. Mechanic looked at it, eventually made me overhaul the engine and finally found that the injector drive unit burned. Replaced it with a 2nd hand one. Lasted 4 months. Thought nothing off it as it was 2nd hand, so forked out money for a new one. 3 weeks later it burned again.. Got it replaced for free as we thought it was a factory fault. Installed a new one again, and 3 months later burned again.

Checked the wiring, replaced the injectors and wiring harness. Intalled a 2nd hand one again and it burned 2 months later…

I have no idea what to check and 4 other Mitsu mechanics have no idea…

Anyone have a idea what to check?