calitri

Hey I have a 1985 rx7 with the 1.1 4bbl my problem is that I am getting hella backfiring from this old dog I have went through and changed out my sparkplugs wires and oil I apologize for my ignorance but this is the first time I have ever messed around with a rotary so please excuse my lack of knowledge on how these work. Anybody have any suggestions? I have also tried to advance the timing and mess with the idle speed control on the carb but nothing seems to work to even out the idle and eliminate the misfiring. Any suggested paths to resolve this issue?