boought a 2003 heritage a few weeks ago , it had 7500 miles on it and i have put around 600 miles on it since then . the problem is it will caugh and or spit just once about every 8 to 10 miles just once and then seems to run perfect for another 8 to 10 or 12 miles and then do it again . just like it will normally do if it is cold and just hasn't warmed up yet ??? starts good , idels good runs good except for the occasional caugh... any ideas ?