???Any Ideas???

you can test / inspect plugs , wires and coils or go ahead and replace them , do you know the history of these parts ? New air filter , check the coolant , is winter knocking on your door ?, coolant can carry contaminates just like oil and should be changed , I got a new radiator and the instructions said not to use tap water only distilled water

Well first knowing how many miles your car has would be helpful. Filters, fluids, spark plugs and belts would be the normal items. Fluids such as engine coolant, engine oil, transmission fluid and brake fluid should be changed. You will need spark plugs if your vehicle has over 100,000 miles on it. Engine serpentine belt(s) and timing belt if so equipped may need replacement. A fresh battery if yours is over 5 years old might be a good idea.