1985 rx7 miss firing or vacuum leak?
 

hey yall,i recently bought an 1985 rx7 that had not ran in quite some years,i bought it for $250 cause engine was no running guy said blown apex.long story short i done the atf in the carb thing and the seafoam,now the car starts right up and runs strong,but im having problems with idle i adjusted idle air and idle speed i got it down to an idle of 1200 but any lower it wants to die.and it has a misfire feel to engine and the rpm's lope up and down slightly.those any body know what it could be? im thinking vacuum. does anybody know of were i can get a vacuum diagram,or pdf? thanx