dont know much about these engines (yet), but do the obvious checks first:
plugs, leads, distributor, check fuels getting to it alright, fuel filter, fuel pump.
never heard of a carb engine doing this so im assuming its a injection you have. so check maf sensor (if it has one), these cars dont come with lambda sensors do they?, idle control valve, give the throttle body a good clean on the inside, check injectors, stick in a bottle of injector cleaner.
if all else fails, get a new engine, ecu, and wiring loom and you'll be sorted
