Are you going over any summits, like Sciriocco (spelling??)? Perhaps the o2 sensor is overheating, or a related thing.

Our experience coming in to Palm Springs from Phoenix was a melted exhaust manifold. Poor little '86 Montero in the August heat of 1995, all the grades and our little trailer taxed the Montero greatly.


1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya