is there any way that being at higher elevation in combination with moderately cold weather could cause hard or impossible starting, because both times my 81 300sd would not start i was parked at ski resorts the temp was not that cold , it has started at sea level with out any trouble in very cold temps?on one occasion with my 76 300d it wouldnt start at the ski hill and had to be towwed to a repair shop and it was never able to be started again and was scrapped.