So I've had this misfire for last couple of weeks. Mostly at idle after warming up. But it has been getting worse. I have done all the suggested,
clean TB, checked plenum between IM and TB, checked everywhere for vacuum leak. All negative. No codes at all. So today I pull a S plug to check it. Surprise, Surprise. Previous owner "cheaped out" and put in ACD R42LTS plugs! Ordered 41-897 today from rock auto. Hope this does the trick otherwise will be checking coils and fuel injectors. Thanks for all the great info here!! Will let you know how it goes.
clean TB, checked plenum between IM and TB, checked everywhere for vacuum leak. All negative. No codes at all. So today I pull a S plug to check it. Surprise, Surprise. Previous owner "cheaped out" and put in ACD R42LTS plugs! Ordered 41-897 today from rock auto. Hope this does the trick otherwise will be checking coils and fuel injectors. Thanks for all the great info here!! Will let you know how it goes.