Left anchorage around 0730. Ten miutes into run motor started sputtering. Switch to other tank and settled down and ran good. Made 34 miles and topped out at 9.6 mph in the Mackay river going to st simon sound. Sound was bumpy but put out genoa and settled down. Anchored behind Jekyll Island. Checked fuel in tank and looks like mud???? Will drain in StMarys tomorrow. For now its Dos XX and nascar on XM radio.