Updates shares Aug 9 (Reuters) - Used-car retailer Carvana CVNA.N expects its third-quarter adjusted core profit to be above $75 mln from its prior forecast of "positive adjusted EBITDA", sending its shares up about 4% in morning trade on Wednesday. Carvana, in an attempt to strengthen its balance sheet and attain positive cash flow, has been trimming inventory and slashing advertising expenses. However, it has since been struggling to sell cars acquired at elevated prices as buyers, hit by inflation and worried about a recession, cut spending.