[s-cars] Stumble/Hesitation at altitude?

[Matthew Pelkey]

Hey Guys,

I was just out in Breckenridge for a week with the Avant and noticed
that it developed a stumble/hesitation while at higher altitudes. I
live in Madison, WI and have never noticed this happening. The only
fuel that was available out there was 91 octane, at home I run 93. The
car has 110K and the only mods are Mihnea's chip and a Samco lower
intercooler hose. Any ideas/explanations?

On another note the car performs awesome in the snow! There was a
nasty storm while we were driving out on 11/27, probably over 40
vehicles in the ditch. I got the car in the summer and haven't had the
opportunity to drive it in snow until this past week. I'm running new
Dunlop Wintersport M2's.

Here's a pic of the car on Boreas Pass Road:
https://mywebspace.wisc.edu/pelkey/web/Breck04/Breck04-Pages/Image37.html

and in the parking lot at Copper Mountain:
https://mywebspace.wisc.edu/pelkey/web/Breck04/Breck04-Pages/Image28.html

Thanks,
Matt