Thanks Erik I'll try to do that this week. When I changed the plugs earlier this year I don't remember that any of them looked particularly bad. Since the last time I changed them they showed evidence of being wet(running rich). That's when I put back the ISR mod and got my mileage back. As a side note I have been hearing a little pinging/ticking so that may be related and my dad's problem also seems to be better with injector cleaner added. So I'll look into maybe getting all the injectors cleaned.

Edit I'll try to remember to take some pics of the plugs.