Almost certainly an earthing issue, apparently one that is affected by having it in gear, or more likely with the clutch disengaged, as it would be presumably when starting in gear. This suggests it is affected by slight engine movement and points to the chassis/engine earth. I'm not sure where this is on the Perentie, but on my 110 of similar age with the Isuzu engine, it is a flat braided strap across the LH engine mount. I also ran a separate heavy earth strap between the gearbox and the chassis.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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