2006 crusaders gas 8.1 epi do these things need tune ups?

[sluggo]

I have 8.1 Crusaders and they started to run rough, stall etc at about 200 hours. Changed all the original Denso plugs  to Champions and now they run like new. If there is a problem you can get a code reader for about $75 that will plug in and pin point the failure.
Fuel filters, oil and filter changes, new zincs, raw water impellers,  that's about it.  At 11 years you should be looking at new elbows before you have a major problem.
Both my 2001 engines run perfectly smooth and trouble free.
Capt. George

Capt George thanks for the info, do you know what you gap the plugs to?  And the which Champion plugs?  (2006 Sovran 8.1 Crusaders)  TIA!