count the # of turns to get the (2) idle mix screws in to lightly seated then remove them & shoot a 3 second blast of starting fluid or brake kleen (whichever can has a thin red straw for the nozzle) into each screw opening then replace the screws to their orig position. that'd be a start. other than that I would check fasteners/hoses for vac leaks & might need to richen the idle mix screws slightly. EDIT what is the hot idle speed? might need bumping up slightly