after i replaced my plugs,wires,cap,and roter, that stuttering went away. but only when im criusing. when i stop..the engine rpms goes way down and it like barly stays running and will stutter a lot trying to get it going. and sometimes..it will be fine! this mourning it was fine..but last night it kept stalling on me cuase it was doin it so bad. i know it was cold also..but it does this also when it is warmed up. ive been told to replace the fuel filter..(mine doesnt even have on cause the nim rod that switched to a holley never put an inline one on. and also to replace the power vavle in the carb. cuase someone told me if it backfires it will blow it or something...and it does mildly back fire when it does this..it sounds diesely or something and a lot quiter and skippier when it does this...but when it doesnt..its fine. any ideas?