Just got rv4 running IO320, airflow performance injector system, can't even climb above 2000 feet without #3 CHT hitting 500. Have to level off and pull throttle. All Others IN 300 Range when it overtemps. Stock setup, Baffling looks fine both sides, no space behind cylinders. All cylinders Peak About Same Time On EGT gage so I don't think it's lean. Stock long cowling we it 13 in spinner, running autogas. Thinking about opening one inch space behind #3 in baffling.