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Since replacing the head gasket, MAF pigtail and TPS pigtail my 22re has been running a lot better. At less than about 5k ft, i'm getting 15-17 mpg whereas before I was getting 13-14. Both before and since the gasket, at about 7k ft I begin to notice slight power loss - no misfiring, but it just seems to take a bit more pedal the get going. Once I get to +9k ft, I'm having to mash the pedal pretty well, and there have been a few times on about a 9% grade I was afraid I might not make it even in 1st gear. When I did the head gasket, I also replaced the water pump, radiator, and fan clutch. Before the new parts, I would regularly see 1/2 to 2/3 on the gauge. Now, regardless of how I work it, the temp guage never goes over about 1/3, so I'm sure it's not overheating. Many years ago I had an old 1955 Dodge pickup w/ a flathead 6. When I was living in Denver for a time, I had to advance the timing and adjust the carb to run a bit richer to make it run right. Then, when I headed back East, I had to reset the timing and carb to factory specs - otherwise, it would ping. The engine doesn't miss or ping (at least noticeably) or "sound funny" at altitude - the only symptom I've been able to detect is a gradual loss of power as the altitude increases. Timing is factory spec at 5deg BTDC w/ jumper and 12deg BTDC w/o jumper. New plugs, wires, cap, rotor shortly before the new head gasket. The TPS has been adjusted following the "feeler gauge" procedure at http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml. I also changed the fuel filter. Can anyone tell me how the 22re's EFI system compensates for altitude changes, or if it even does? Do I need to make any manual adjustments to compensate for high altitude? Is my ECU failing? Any other thoughts, suggestions appreciated. Thanks