1989 Hyundai Sonata my car wont stop stalling

Hi sorry can't donate anything cause hyundai just drained my bank account anyway have been having problems with my car it stalls its self while driving along and sometime wont start again hyundai have put in a new air flow meter and a new computer have checkd the distributor cap and found nothing wrong yet all these expensivwe things have failed to fix the problem am asking anyone for help because this car has been doing this for over 12 months and hyundai don't seem to be able to fix it for some reason dont know why they did build it so if you can help please do
Thanks
bree