even after a complete tune up , still have a miss ,where to look now? on 1995 Chevrolet Tahoe

the miss can occur at any speed, i changed out the fuel filter, running seafoam now, changed out air filter also ,dont know any diganostic codes . thanks

Asked by for the 1995 Chevrolet Tahoe
How about the spark plugs, Distributor cap and rotor, and the spark plug wires because any one of these components can cause a miss