Ok guys need some more help here. What effect does altitude have on tuning a carburator? I recently got my car out here in Seattle (from Iowa) and I'm thinking the altitude change is messing with the carb. I pulled a plug yesterday and it was all carbon'd up. Does a lower altitude make a car run richer?

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1969 Caprice 4400LBS!!
454/M-20
12-bolt 4.10 Posi
13.45 @ 105
323HP @ 5200RPM
382lb-ft @ 3300RPM at the wheels!

The lower altitude would make the car run leaner, as the air is more dense as you get closer to sea level. What carb do you have? If it is a Holley, the power valve may be ruptured, which will make the car run rich at idle and low speed. This is a very common problem with Holleys.

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Bill
64 Chevelle Malibu Sport Coupe (original owner) car now has 427" BB, Chrysler HEMI 4-spd. trans., 12 bolt 5.57 w/spool & axles.
"HOT RODDER is NOT a dirty word"
"Too much horsepower is just enough"