So my trooper has been sitting basically since December I always run high test gas and its run here and there at idle from time to time last time it ran seemed ok today while idling it seemed little choppy and giving it gas seemed to be breaking up a little kinda like a misfire I have about 1400 miles on it I plan on dumping the gas and will inspect the plugs I have ngk iridium plugs in it been there since 1200 miles know also have a fuel programmer on stage 1 factory never have changed it thoughts anyone????