Went today with my brother to look at a 2006 H3 with 71,000 on it.
it ran ok till it warmed up we drove it about a 30 minutes ran great
stopped to look it over then it stared chugging like it was going to die but never died
did it for about 10 seconds then stopped ran great for about 2 or 3 minutes
did it started again we sat there for 15 minutes it did it on an off for the whole time the rpms never moved
no check engine light so we took it to autozone to see if their was any codes
none so my question is it the head ?