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Ox66 running rough smoking stalls Surging. Sneezing, last year replaced all filters lift pumps cleaned o2 , had injections cleaned . Fuel pressure 38 and steady but runs rough at idle. Will stall when put in gear , or idle down and quit running , then hard to start . I sent out injectors and will Change all filters , ran fine last year vst tank fills up and no change in running when pumping ball . Maybe o2 ? Any help appreciated.