Why is car loseing power then cuts out like its choking or no gas getting threw

What is your question?

It will go ok for a few days when I get carborator jets blown I've had fuel filter replaced,spark plugs,spark plug leads,distributor cap .theres no oil leaking no water where oil goes .this has been happening for 2 months on and off the longest it was going ok was week and half.Dont want to take repair shop if it's not repairable or if going to cost more to fix than its worth. Please advise very much appreciated.