Well replaced following wirers, plugs, coil wire, injectors, mechanic said distributors looked good, also replaced muffler all of cat was inside muffler made big diffrerence on power, but still have slight miss at constant RPM say at 3000 or 4000 acceleration excellent. Mechanic checked diplex connections good ground. What is left going nuts, miss is just enough to be noticed and a pain. When idleling you can hear at exhaust pipe miss every other milesecond or so just little tick tick. Ok men who wins with correct answer? I appreciate all your input, thank you going nuts Ferrari owner.