Wouldn't hurt to go back through 'em. I usually soak 'em for a day or two in carb cleaner. After that, shop air with a blow gun and about a can of WD40.... hitting the passageways from both ends numerous times. Here's a little trick... 16-18ga elec wire un-stranded. The wire's copper so it won't hurt the carb bodies or the jets... and small enough to go anywhere.Maybe when I cleaned the carbs I didn't actually clean the obstruction(if there was one) and only moved it