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1990, with basically stock 4.0. Recently upgraded to Volvo 4 hole injectors. Runs great, better gas mileage. Most of my driving is sea level to 1000 feet. Went to Eastern Washington and crossed one pass at 5400 ft and into a back-country lake at 2200+ feet. On both I noticed a definite loss of power and overheating. The route into the lake was only 2200 to 4000 feet, but was done slowly on a rough, rocky road. The initial 1000 feet was very steep and overheated to boiling over. The pass was highway speeds, 60 mph, and overheated, but not to the red-line. Dropped off as soon as I started downhill and dropped rpm. I noticed a definite lack of power each time. I reset the ECM after adding the new injectors, and it's been running great, but wonder if I could be running lean, particularly at altitude. Reset ECM again, other suggestions??? Next step will be upgrading to a open (real radiator and cooling) system.