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Belching smoke and running better when it's cool are both consistent with the engine running rich. Cool air is denser (i.e. more oxygen), so other things being equal, more fuel is required to make the ideal air/fuel mixture. Elevation can definitely play a role in the running of your car, but I'd be surprised if at is last tuneup the mechanic changed jetting in your carbs. Assuming your carbs are jetted correctly, they may need a good cleaning or a rebuild. It's not uncommon for carbs to get gummed up, especially if the car has been sitting. If you haven't already, check a couple sparkplugs. A rich mixture will yield black sparkplugs. This would be good information to know for starters.
Scott
Last edited by stownsen914; 12-08-2015 at 04:07 AM..
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