please help i have a 85 rx7

:banghead:i have a 85 mazda rx7 an it dont want to run right it keeps popping an soundes like it wants to cut off im just trying to find out if it is worth the time an money to do it has a 13b fuel injection an i want to fix the car but if its going to cost me a but load of money im going to sell it so any info will help


thanks big

at idle?