What year and model car?

When I got up here which I think is 5000ft....I had a lot of issues....my car wouldn't start, it was due to the battery, starter, cables and glow plugs.....when you come to high altitude, you have to make sure everything is tip top condition. If your valves were tight, then I would suggest adjusting them again....I am going out side to do my third adjust since I have been here and its only been 7 months...I am lucky to keep 55mph on a step hill....right now I have been getting down to 40....so I know my valves are tight...

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