Are you using lump or briqs?
I've only had problems with lump on long cooks choking out. I remove the cook grate/meats and give the basket a few shakes with my "chit hook".
I only run straight lump on short cooks-@4-5 hours, any longer I'll mix lump and briqs.
Brian - Left Hand Smoke BBQ PNWBA 2010 Team of the Year
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