Pressure clean your leaking fuel injectors. 

That means that you’re running rich. Clean fuel injectors check air filter and spark plugs go from there.

"It Ain't running right!"

Hey bud, sry to hear about your problem. Did your check engine light ever come on? That would give the first clue on where to start. Cluttering sounds can mean sputter-ringing or clonking to other people so it is not the best clue. Mentioning your make/model/year/mileage can give more clues to some common problems with that specific vehicle. Going on intuition alone I would say that your problem sounds like a vacuum leak. Some cars can give vacuum leaks around gaskets and other parts that open up only after the car has warmed up some. Metal expands and contracts on heating and cooling and gaskets can only keep up with those cycles for so long before going bad. The worst gasket to go out would be the cylinder head gasket but there are some other tell-tale signs of this problem.  You may see brown fudge looking buildup on your valve cover cap or radiator cap. There are simple to use test kits that test for exhaust fumes going into your radiator also, scotty has a vid on that. You can scan for trouble codes for free at your local autozone or buy a cheap 20usd scan tool to check yourself at home. gl come back with some more info, there are many kind folk on here to help 🙂

Definitely Need more info on year and engine