I have replaced my plugs, plug wires,and ign. coil

try LUCAS fuel additive and 2 bottle of heet with a small amount of gas premium if possible run untill u get down low on fuel or untill problem is gone

if it is not indicating a code you are pretty much in the dark ,it may be too rich of a mixture take a plug out to see if it is black or very white, just for the hell of it take it to auto zone or advance and try reading a code sometime a hard code is stored and it can point you in the right direction so you don't spend money on unneed parts, next step buy a compression tester and see if the ***** is pushin at least 120 psi on all six anything under 90 is not good