Hello all -

As I drove my 87 syncro over the Sierra Nevada last
weekend, I noticed my usually peppy "boston bob" 2.1
waterboxer getting quite sluggish at high altitudes.
The westys were crusin' past me with no worries as I
plugged along at ~20 mph in 2nd gear.

This seemed to be most noticeable above 6000-7000 ft.
When I returned to lower elevation, the engine regains
health and runs like a champ.

Any ideas what is causing this? Is there some sort of
air pressure sensor?
Thanks in advance!

Cheers,
Daniel

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