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The mechanics from three shops are all scratching their heads over this.


If none of the shops have consulted the FSM for diagnostic procedures then you need to find a more capable shop.


With you on that.

Something else to check. After pouring over service manuals I'd check the ECM grounding. It sounds like everything sensor and computer related is fine if it runs well when it runs. Sudden off/on running is almost certainly electrical and the older a vehicle gets proper grounding becomes a problem.

I have a similar on again off again problem. If you hose my big Sport down or drive it through a rain storm, all the electrical works perfectly. Until everything drys out again. smile

Edward

'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD